Document and Entity Information	6 Months Ended
Document and Entity Information	Jun. 30, 2015	Jul. 31, 2015
Document Document And Entity Information [Abstract]
Entity Registrant Name	HORNBECK OFFSHORE SERVICES INC /LA
Entity Central Index Key	0001131227
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Trading Symbol	HOS
Amendment Flag	false
Entity Common Stock, Shares Outstanding		35,834,110

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 263,405	$ 185,123
Accounts receivable, net of allowance for doubtful accounts of $2,773 and $3,693, respectively	105,180	130,969
Deferred Tax Assets, Net of Valuation Allowance, Current	27,505	45,531
Other current assets	19,290	20,049
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current	26,894	0
Current assets from discontinued operations	0	470
Total current assets	442,274	382,142
Property, plant and equipment, net	2,498,056	2,459,486
Deferred charges, net	60,221	68,953
Other assets	11,850	11,870
Total assets	3,012,401	2,922,451
Current liabilities:
Accounts payable	55,846	42,404
Accrued interest	14,886	14,890
Accrued payroll and benefits	10,056	14,830
Deferred revenue	499	1,561
Other accrued liabilities	16,225	9,359
Current liabilities from discontinued operations	0	1
Total current liabilities	97,512	83,045
Long-term debt, net of original issue discount of $46,634 and $51,528 respectively	1,078,366	1,073,472
Deferred tax liabilities, net	404,251	392,492
Other liabilities	1,573	1,117
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	1,560
Total liabilities	1,581,702	1,551,686
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock: $0.01 par value; 100,000 shares authorized; 35,816 and 35,557 shares issued and	358	356
Additional paid-in-capital	741,412	736,294
Retained earnings	690,085	635,017
Accumulated other comprehensive loss	(1,156)	(902)
Total stockholders’ equity	1,430,699	1,370,765
Total liabilities and stockholders’ equity	$ 3,012,401	$ 2,922,451

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts	$ 2,773	$ 3,693
Long-term debt, net of original issue discount	$ 46,634	$ 51,528
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock shares authorized	5,000,000	5,000,000
Preferred stock issued	0	0
Preferred stock outstanding	0	0
Common stock Par Value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized	100,000,000	100,000,000
Common stock issued	35,816,000	35,557,000
Common stock outstanding	35,816,000	35,557,000

Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified

3 Months Ended

6 Months Ended

Jun. 30, 2015

Jun. 30, 2014

Jun. 30, 2015

Jun. 30, 2014

Income Statement [Abstract]

Revenues

$ 136,446

$ 171,099

$ 271,070

$ 307,684

Costs and expenses:

Operating expenses

57,542

71,405

118,962

139,986

Depreciation

20,172

17,612

40,156

33,797

Amortization

6,314

9,931

13,800

23,106

General and administrative expenses

13,063

15,487

24,955

29,172

Costs and Expenses, Total

97,091

114,435

197,873

226,061

Gain on sale of assets

33,056

161

Operating income

39,355

56,756

106,253

81,784

Other income (expense):

Interest income

393

283

607

647

Interest expense

(9,921)

(7,016)

(20,183)

(14,248)

Other income (expense), net

482

922

(37)

Nonoperating Income (Expense), Total

(9,046)

(6,693)

(18,654)

(13,638)

Income before income taxes

30,309

50,063

87,599

68,146

Income tax expense

11,094

18,838

32,531

25,567

Income from continuing operations

19,215

31,225

55,068

42,579

Income from discontinued operations, net of tax

^[1]

420

^[1]

Net income

$ 19,215

$ 31,233

$ 55,068

$ 42,999

Earnings per share:

Basic earnings per common share from continuing operations

$ 0.54

$ 0.86

$ 1.54

$ 1.18

Basic earnings per common share from discontinued operations

$ 0.00

$ 0.01

Basic earnings per common share

$ 0.54

$ 0.86

$ 1.54

$ 1.19

Diluted earnings per common share from continuing operations

$ 0.53

$ 0.85

$ 1.52

$ 1.16

Diluted earnings per common share from continuing operations

$ 0.00

$ 0.01

Diluted earnings per common share, Dollars per Share

$ 0.53

$ 0.85

$ 1.52

$ 1.17

Weighted average basic shares outstanding

35,706

36,254

35,668

36,212

Weighted average diluted shares outstanding

36,253

36,775

36,190

36,746

[1]	On August 29, 2013, the Company closed the sale of its Downstream segment.

Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 19,215	$ 31,233	$ 55,068	$ 42,999
Other comprehensive income:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	48	129	(254)	225
Total comprehensive income	$ 19,263	$ 31,362	$ 54,814	$ 43,224

Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Income from continuing operations	$ 55,068	$ 42,579
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation	40,156	33,797
Amortization	13,800	23,106
Stock-based compensation expense	4,774	6,316
Provision for bad debts	(920)	143
Deferred tax expense	32,535	24,758
Amortization of deferred financing costs	4,850	3,950
Gain on sale of assets	(33,056)	(161)
Changes in operating assets and liabilities:
Accounts receivable	26,461	(34,513)
Other receivables and current assets	1,154	(7,611)
Deferred drydocking charges	(6,309)	(29,640)
Accounts payable	440	13,290
Accrued liabilities and other liabilities	(4,200)	(15,288)
Accrued interest	(4)	(4)
Net cash provided by operating activities	134,749	60,722
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program	(119,332)	(208,720)
Net proceeds from sale of assets	114,000	103
Vessel capital expenditures	(36,245)	(30,622)
Non-vessel capital expenditures	(14,605)	(1,195)
Net cash used in investing activities	(56,182)	(240,434)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax benefit from share-based payments	0	283
Deferred financing costs	(1,997)	0
Net cash proceeds from other shares issued	1,966	2,217
Net cash provided by (used in) financing activities	(31)	2,500
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by operating activities	0	677
Net cash provided by investing activities	0	1,288
Net cash provided by discontinued operations	0	1,965
Effects of exchange rate changes on cash	(254)	225
Net increase (decrease) in cash and cash equivalents	78,282	(175,022)
Cash and cash equivalents at beginning of period	185,123	439,291
Cash and cash equivalents at end of period	263,405	264,269
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	25,272	25,272
Cash paid for income taxes	$ 1,884	$ 1,711

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements do not include certain information and footnote disclosures required by United States generally accepted accounting principles, or GAAP. The interim financial statements and notes are presented as permitted by instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, all adjustments necessary for a fair presentation of the interim financial statements have been included and consist only of normal recurring items. The unaudited quarterly financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Annual Report on Form 10-K of Hornbeck Offshore Services, Inc. (together with its subsidiaries, the “Company”) for the year ended December 31, 2014. The results of operations for the six months ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. The consolidated balance sheet at December 31, 2014 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements.

Recent Accounting Pronouncements (Notes)	6 Months Ended
Recent Accounting Pronouncements (Notes)	Jun. 30, 2015
Recent Accounting Pronouncements [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements On April 7, 2015, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update (ASU) No. 2015-03, "Interest - Imputation of Interest - Simplifying the Presentation of Debt Issuance Costs" (Subtopic 835-30). The amendments in ASU No. 2015-03 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in ASU No. 2015-03. Therefore, the amortization of such costs will continue to be calculated using the interest method and be reported as interest expense. ASU No. 2015-03 requires retrospective application and will be effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early application is permitted. The Company has approximately $14.6 million of debt issuance costs related to its outstanding senior notes and convertible senior notes that will be subject to this accounting standard. The Company is evaluating the effect of this new standard on its financial statements. On May 28, 2014, the FASB issued Accounting Standards Update (ASU) No. 2014-09, "Revenue from Contracts with Customers" (Topic 606), which supersedes the revenue recognition requirements in FASB Accounting Standard Codification (ASC) Topic 605, "Revenue Recognition." On July 9, 2015, the FASB voted to defer the effective date of ASU No. 2014-09 by one year to December 15, 2017 for interim and annual reporting periods beginning after that date and permitted early adoption of the standard, but not before the original effective date of December 15, 2016. ASU No. 2014-09 requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 requires retrospective application. The Company is evaluating the effect of this new standard on its financial statements.

Earnings Per Share

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Earnings Per Share

Basic earnings per common share was calculated by dividing income from continuing operations and income from discontinued operations by the weighted average number of common shares outstanding during the period. Diluted earnings per common share was calculated by dividing income from continuing operations and income from discontinued operations by the weighted average number of common shares outstanding during the year plus the effect of dilutive stock options and restricted stock unit awards. Weighted average number of common shares outstanding was calculated by using the sum of the shares determined on a daily basis divided by the number of days in the period. The table below reconciles the Company’s earnings per share (in thousands, except for per share data):



	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Income from continuing operations	$	19,215	$	31,225	$	55,068	$	42,579
Income from discontinued operations, net of tax (1)	—		8		—		420
Net income	$	19,215	$	31,233	$	55,068	$	42,999
Weighted average number of shares of common stock outstanding	35,706		36,254		35,668		36,212
Add: Net effect of dilutive stock options and unvested restricted stock (2)(3)(4)	547		521		522		534
Weighted average number of dilutive shares of common stock outstanding	36,253		36,775		36,190		36,746
Earnings per common share:
Basic earnings per common share from continuing operations	$	0.54	$	0.86	$	1.54	$	1.18
Basic earnings per common share from discontinued operations	—		—		—		0.01
Basic earnings per common share	$	0.54	$	0.86	$	1.54	$	1.19
Diluted earnings per common share from continuing operations	$	0.53	$	0.85	$	1.52	$	1.16
Diluted earnings per common share from discontinued operations	—		—		—		0.01
Diluted earnings per common share	$	0.53	$	0.85	$	1.52	$	1.17


(1)	On August 29, 2013, the Company closed the sale of its Downstream segment.

(2)

For the three and six months ended June 30, 2015, the Company had 326 and 332 anti-dilutive stock options, respectively. For the three and six months ended June 30, 2014, the Company had no anti-dilutive stock options. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

(3)

For the three and six months ended June 30, 2015 and 2014, the 2019 convertible senior notes were not dilutive, as the average price of the Company’s stock was less than the effective conversion price of such notes. It is the Company's stated intention to redeem the principal amount of its 2019 convertible senior notes in cash and the Company has used the treasury method for determining potential dilution in the diluted earnings per share computation.


(4)	Dilutive unvested restricted stock units are expected to fluctuate from quarter to quarter depending on the Company’s performance compared to a predetermined set of performance criteria. See Note 6 to these financial statements for further information regarding certain of the Company’s restricted stock grants.

Assets Held for Sale (Notes)	6 Months Ended
Assets Held for Sale (Notes)	Jun. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Assets held for sale [Text Block]	Assets Held for Sale On February 27, 2015, the Company closed on the sale of three 250EDF class OSVs, the HOS Arrowhead, the HOS Eagleview and the HOS Westwind, which were previously chartered to the U.S. Navy, for cash consideration of $114.0 million. The sale resulted in a pre-tax gain of approximately $33.1 million ($20.7 million after-tax or $0.57 per diluted share). The vessel purchase agreement includes an option for the acquisition of a fourth vessel currently under charter to the U.S. Navy, the HOS Black Powder. This purchase option expires on September 30, 2016. In recognition of the purchase option for the HOS Black Powder, the Company has accounted for this vessel as an asset held for sale. As of December 31, 2014, this vessel and its deferred regulatory drydocking costs were included in the Company's fixed assets and deferred charges in the amounts of $25.9 million and $1.2 million, respectively. Since March 31, 2015, the asset and its deferred regulatory drydocking costs have been classified as assets held for sale. The Company has suspended its depreciation and amortization for the vessel until the purchase option is exercised, which is expected to occur on or before September 30, 2015.

Long-Term Debt

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Long-Term Debt

As of the dates indicated, the Company had the following outstanding long-term debt (in thousands):



	June 30, 2015		December 31, 2014
5.875% senior notes due 2020	$	375,000	$	375,000
5.000% senior notes due 2021	450,000		450,000
1.500% convertible senior notes due 2019, net of original issue discount of $46,634 and $51,528	253,366		248,472
Revolving credit facility due 2020	—		—
	1,078,366		1,073,472
Less current maturities	—		—
	$	1,078,366	$	1,073,472

The table below summarizes the Company's cash interest payments (in thousands):



	Semi-Annual Cash Interest Payment		Payment Dates
5.875% senior notes due 2020	$	11,000	April 1 and October 1
5.000% senior notes due 2021	11,300		March 1 and September 1
1.500% convertible senior notes due 2019	2,300		March 1 and September 1

As of June 30, 2015, there were no amounts drawn under the Company’s $300.0 million revolving credit facility and $0.5 million posted as letters of credit. As of June 30, 2015, the Company was in compliance with all financial covenants required by its revolving credit facility and the full amount of the undrawn borrowing base under the facility was available to the Company for all permissible uses of proceeds, including working capital, if necessary.

The Company estimates the fair value of its 2020 senior notes, 2021 senior notes and 2019 convertible senior notes by primarily using quoted market prices. The fair value of the Company’s revolving credit facility, when there are outstanding balances, approximates its carrying value. The face value, carrying value and fair value of the Company’s total debt was $1,125.0 million, $1,078.4 million and $972.1 million, respectively, as of June 30, 2015. Given the observability of the inputs to these estimates, the fair values presented for long-term debt have been assigned a Level 2 of the three-level valuation hierarchy.

Capitalized Interest

During the three and six months ended June 30, 2015, the Company capitalized approximately $6.1 million and $11.9 million, respectively, of interest costs related to the construction of vessels. During the three and six months ended June 30, 2014, the Company capitalized approximately $9.0 million and $17.7 million, respectively, of interest costs related to the construction of vessels.

Incentive Compensation

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Incentive Compensation

Stock-Based Incentive Compensation Plan

In June 2015, the Company received stockholder approval to increase the maximum number of shares available under its long-term compensation plan by 750,000. The Company’s stock-based incentive compensation plan now covers a maximum of 4.95 million shares of common stock that allows the Company to grant restricted stock awards, restricted stock unit awards, or collectively restricted stock, stock options, stock appreciation rights and fully-vested common stock to employees and directors. As of June 30, 2015, the Company has granted awards covering 4.0 million shares of common stock under such plan.

During the six months ended June 30, 2015, the Company granted cash-settled phantom restricted stock units, time-based restricted stock units, performance-based restricted stock units and fully-vested common stock as noted in the table below.



	Directors	Executive Officers	Certain Managers
Cash-settled phantom restricted stock units		X	X
Time-based restricted stock units		X
Performance-based restricted stock units		X
Fully-vested common stock	X

The shares to be received under the performance-based restricted stock units are calculated based on the Company’s performance compared to three pre-determined criteria, as defined by the restricted stock agreements governing such awards. The actual number of shares that could be received by the award recipients can range from 0% to 150% of the awards granted depending on the Company’s performance. During the six months ended June 30, 2015, the Company granted 353,940 time-based and performance-based restricted stock units, 42,692 cash-settled phantom restricted stock units and 21,737 shares of fully-vested common stock.

Compensation expense related to 2015 restricted stock unit grants is recognized over the three-year service period. The fair value of the Company’s performance-based restricted stock units, which is the stock price on the date of grant, is applied to the total shares that are expected to fully vest and is amortized over the vesting period, which is generally three years, based on the Company’s internal performance measured against the pre-determined criteria, as applicable. The compensation expense related to time-based restricted stock units and cash-settled phantom restricted stock units are amortized over a vesting period of up to three years, as applicable, and is determined based on the market price of the Company’s stock on the date of grant applied to the total shares that are expected to fully vest. The cash-settled phantom restricted stock units are re-measured quarterly and classified as a liability, due to the settlement of these awards in cash. In addition to the restricted stock units granted in 2015, the Company granted performance-based and time-based restricted stock units in 2012, 2013 and 2014. During the six months ended June 30, 2015, the Company issued 258,912 shares, in the aggregate, of stock due to: 1) employees exercising previously vested stock options, 2) vestings of restricted stock units, 3) employee purchases under the Company's Employee Stock Purchase Plan and 4) the issuance of fully-vested common stock.

Stock-based compensation expense charges from previously issued equity grants and the financial impact such grants have on the Company’s operating results are reflected in the table below (in thousands, except for per share data):



	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Income before taxes	$	2,802	$	3,685	$	4,774	$	6,316
Net income	$	1,776	$	2,298	$	3,001	$	3,946
Earnings per common share:
Basic earnings per common share	$	0.05	$	0.06	$	0.08	$	0.11
Diluted earnings per common share	$	0.05	$	0.06	$	0.08	$	0.11

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Vessel Construction The Company's fifth OSV newbuild program consists of vessel construction contracts with three domestic shipyards to build four 300 class OSVs, five 310 class OSVs, ten 320 class OSVs and five 310 class MPSVs. As of June 30, 2015, the Company had placed 17 vessels in service under such program. The seven remaining vessels under this 24-vessel domestic newbuild program are currently expected to be placed in service as follows: three in the remainder of 2015 and four in 2016. Based on current contracts and internal estimates, the aggregate cost of this program, excluding construction period interest, is expected to be approximately $1,265.0 million, of which $68.4 million and $54.9 million are expected to be incurred in the remainder of 2015 and fiscal 2016, respectively. From the inception of this program through June 30, 2015, the Company had incurred $1,141.7 million, or 90.3%, of total expected project costs. Contingencies In the normal course of its business, the Company becomes involved in various claims and legal proceedings in which monetary damages are sought. The Company insures against losses relating to its vessels, pollution and third party liabilities, including claims by employees under Section 33 of the Merchant Marine Act of 1920, or the Jones Act. Third party liabilities and pollution claims that relate to vessel operations are covered by the Company’s entry in a mutual protection and indemnity association, or P&I Club, as well as by marine liability policies in excess of the P&I Club’s coverage. The Company provides reserves for any individual claim deductibles for which the Company remains responsible by using an estimation process that considers Company-specific and industry data, as well as management’s experience, assumptions and consultation with outside counsel. As additional information becomes available, the Company will assess the potential liability related to its pending claims and revise its estimates. Although revisions to such estimates historically have not been material, changes in estimates of the potential liability could materially impact the Company’s results of operations, financial position or cash flows. Vessel charters with Petrobras include limitations regarding fuel consumption. Petrobras has asserted claims against the Company relating to excess fuel consumption. The Company’s exposure for these assessments is in the range of approximately $0.5 million to $3.0 million. The Company disagrees with these assessments. During the second quarter of 2015, the Brazilian court ruled in the Company's favor related to these claims. Subsequent to this ruling, Petrobras appealed this decision to a higher court. While the Company cannot currently estimate the amounts or timing of the resolution of these matters, the Company believes that the outcome will not have a material impact on its liquidity or financial position, but the ultimate resolution could have a material impact on its interim or annual results of operations. During 2013, the Company commenced the process of assigning the in-country vessel management services for its four vessels operating in Brazil from a third-party provider to a wholly-owned subsidiary of the Company. As a result, this assignment may be interpreted by local authorities as a new importation of these vessels resulting in an importation assessment ranging from $0.5 million to $3.5 million. The Company disagrees with this interpretation. As of June 30, 2015, these potential duties have not been assessed or recorded in its financial statements. While the Company cannot estimate the amounts or timing of the resolution of this matter, the Company believes that the outcome will not have a material impact on its liquidity or financial position, but the ultimate resolution could have a material impact on its interim or annual results of operations. During 2012, an Upstream customer, ATP Oil and Gas, Inc., initiated a reorganization proceeding under Chapter 11 of the United States Bankruptcy Code. Pre-petition receivables from ATP were $4.8 million and the Company has recorded $0.9 million in reserves. While the Company believes that the net receivables are collectible, it will continue to monitor the proceedings, which may result in actual collections that may differ materially from the current estimate.

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Reconciliation of Earnings Per Share

The table below reconciles the Company’s earnings per share (in thousands, except for per share data):



	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Income from continuing operations	$	19,215	$	31,225	$	55,068	$	42,579
Income from discontinued operations, net of tax (1)	—		8		—		420
Net income	$	19,215	$	31,233	$	55,068	$	42,999
Weighted average number of shares of common stock outstanding	35,706		36,254		35,668		36,212
Add: Net effect of dilutive stock options and unvested restricted stock (2)(3)(4)	547		521		522		534
Weighted average number of dilutive shares of common stock outstanding	36,253		36,775		36,190		36,746
Earnings per common share:
Basic earnings per common share from continuing operations	$	0.54	$	0.86	$	1.54	$	1.18
Basic earnings per common share from discontinued operations	—		—		—		0.01
Basic earnings per common share	$	0.54	$	0.86	$	1.54	$	1.19
Diluted earnings per common share from continuing operations	$	0.53	$	0.85	$	1.52	$	1.16
Diluted earnings per common share from discontinued operations	—		—		—		0.01
Diluted earnings per common share	$	0.53	$	0.85	$	1.52	$	1.17


(1)	On August 29, 2013, the Company closed the sale of its Downstream segment.

(2)

(3)


(4)	Dilutive unvested restricted stock units are expected to fluctuate from quarter to quarter depending on the Company’s performance compared to a predetermined set of performance criteria. See Note 6 to these financial statements for further information regarding certain of the Company’s restricted stock grants.

Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Outstanding Long-Term Debt

As of the dates indicated, the Company had the following outstanding long-term debt (in thousands):



	June 30, 2015		December 31, 2014
5.875% senior notes due 2020	$	375,000	$	375,000
5.000% senior notes due 2021	450,000		450,000
1.500% convertible senior notes due 2019, net of original issue discount of $46,634 and $51,528	253,366		248,472
Revolving credit facility due 2020	—		—
	1,078,366		1,073,472
Less current maturities	—		—
	$	1,078,366	$	1,073,472

The table below summarizes the Company's cash interest payments (in thousands):



	Semi-Annual Cash Interest Payment		Payment Dates
5.875% senior notes due 2020	$	11,000	April 1 and October 1
5.000% senior notes due 2021	11,300		March 1 and September 1
1.500% convertible senior notes due 2019	2,300		March 1 and September 1

Incentive Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Financial Impact of Stock-Based Compensation Expense Charges

tock-based compensation expense charges from previously issued equity grants and the financial impact such grants have on the Company’s operating results are reflected in the table below (in thousands, except for per share data):



	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Income before taxes	$	2,802	$	3,685	$	4,774	$	6,316
Net income	$	1,776	$	2,298	$	3,001	$	3,946
Earnings per common share:
Basic earnings per common share	$	0.05	$	0.06	$	0.08	$	0.11
Diluted earnings per common share	$	0.05	$	0.06	$	0.08	$	0.11

Reconciliation of Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified

3 Months Ended

6 Months Ended

Jun. 30, 2015

Jun. 30, 2014

Jun. 30, 2015

Jun. 30, 2014

Earnings Per Share [Abstract]

Income from continuing operations

$ 19,215

$ 31,225

$ 55,068

$ 42,579

Income from discontinued operations, net of tax

^[1]

420

^[1]

Net income

$ 19,215

$ 31,233

$ 55,068

$ 42,999

Weighted average number of shares of common stock outstanding

35,706,000

36,254,000

35,668,000

36,212,000

Add: Net effect of dilutive stock options and unvested restricted stock

547,000

^[2],[3],[4]

521,000

^[2],[3],[4]

522,000

^[2],[3],[4]

534,000

^[2],[3],[4]

Weighted average number of dilutive shares of common stock outstanding

36,253,000

36,775,000

36,190,000

36,746,000

Earnings per common share:

Basic earnings per common share from continuing operations

$ 0.54

$ 0.86

$ 1.54

$ 1.18

Basic earnings per common share from discontinued operations

$ 0.00

$ 0.01

Basic earnings per common share, Dollars per Share

$ 0.54

$ 0.86

$ 1.54

$ 1.19

Diluted earnings per common share from continuing operations

$ 0.53

$ 0.85

$ 1.52

$ 1.16

Diluted earnings per common share from continuing operations

$ 0.00

$ 0.01

Diluted earnings per common share, Dollars per Share

$ 0.53

$ 0.85

$ 1.52

$ 1.17

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount

326

332

[1]	On August 29, 2013, the Company closed the sale of its Downstream segment.
[2]	Dilutive unvested restricted stock units are expected to fluctuate from quarter to quarter depending on the Company’s performance compared to a predetermined set of performance criteria. See Note 6 to these financial statements for further information regarding certain of the Company’s restricted stock grants.
[3]	For the three and six months ended June 30, 2015 and 2014, the 2019 convertible senior notes were not dilutive, as the average price of the Company’s stock was less than the effective conversion price of such notes. It is the Company's stated intention to redeem the principal amount of its 2019 convertible senior notes in cash and the Company has used the treasury method for determining potential dilution in the diluted earnings per share computation.
[4]	For the three and six months ended June 30, 2015, the Company had 326 and 332 anti-dilutive stock options, respectively. For the three and six months ended June 30, 2014, the Company had no anti-dilutive stock options. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

Assets Held for Sale (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
Assets Held for Sale (Details) (USD $)	Feb. 27, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Feb. 27, 2015 Vessel	Dec. 31, 2014
Assets Held For Sale - Vessels Previously Sold [Abstract]
NumberofVesselsSold						3
Proceeds from Sale of Other Property, Plant, and Equipment	$ 114,000,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		0	92,000	33,056,000	161,000
Gain (Loss) on Disposition of Other Assets	20,700,000
Gain (Loss) on Disposition of Assets, net of tax per share	$ 0.57
Long Lived Assets Held-for-sale [Line Items]
Disposal Group, Including Discontinued Operation, Assets, Noncurrent							25,900,000
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent							$ 1,200,000

Outstanding Long-Term Debt (Detail) (USD $)	6 Months Ended	12 Months Ended
Outstanding Long-Term Debt (Detail) (USD $)	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 1,078,366,000	$ 1,073,472,000
Long-term Debt, Current Maturities	0	0
Long-term Debt, Excluding Current Maturities	1,078,366,000	1,073,472,000
Long-term debt, net of original issue discount	46,634,000	51,528,000
Senior Notes 5.875 Percent Due 2020
Debt Instrument [Line Items]
Senior Notes	375,000,000	375,000,000
Interest Rate	5.875%	5.875%
Maturity	2020	2020
Senior Notes 5.000 Percent Due 2021
Debt Instrument [Line Items]
Senior Notes	450,000,000	450,000,000
Interest Rate	5.00%	5.00%
Maturity	2021	2021
Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Senior Notes	253,366,000	248,472,000
Interest Rate	1.50%	1.50%
Maturity	2019	2019
Long-term debt, net of original issue discount	46,634,000	51,528,000
Revolving Credit Facility Due 2016
Debt Instrument [Line Items]
Revolving credit facility due 2020	$ 0	$ 0
Maturity	2020	2020

Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	0 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jun. 30, 2015 Letter of Credit	Jun. 30, 2015 Senior Notes 5.875 Percent Due 2020	Dec. 31, 2014 Senior Notes 5.875 Percent Due 2020	Jun. 30, 2015 Senior Notes 5.000 Percent Due 2021	Dec. 31, 2014 Senior Notes 5.000 Percent Due 2021	Jun. 30, 2015 Undrawn senior secured revolving credit facility	Jun. 30, 2015 Convertible 1.500 Percent Senior Notes Due 2019	Dec. 31, 2014 Convertible 1.500 Percent Senior Notes Due 2019	Jun. 30, 2015 Revolving Credit Facility Maturing Twenty Sixteen [Member]	Dec. 31, 2014 Revolving Credit Facility Maturing Twenty Sixteen [Member]	Oct. 01, 2015 Subsequent Event [Member] Senior Notes 5.875 Percent Due 2020	Sep. 02, 2015 Subsequent Event [Member] Senior Notes 5.000 Percent Due 2021	Sep. 02, 2015 Subsequent Event [Member] Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity											$ 300,000,000.0
Debt Instrument Maturity Year							2020	2020	2021	2021		2019	2019	2020	2020
Long-term debt, net of original issue discount	46,634,000		46,634,000		51,528,000							46,634,000	51,528,000
Debt Instrument, Interest Rate, Stated Percentage							5.875%	5.875%	5.00%	5.00%		1.50%	1.50%
Senior notes, cash tender offer commenced							375,000,000	375,000,000	450,000,000	450,000,000		253,366,000	248,472,000
Debt instrument, principal amount	1,125,000,000		1,125,000,000
Semi-Annual Cash Interest Payment																11,000,000	11,300,000	2,300,000
Letter of credit						500,000.0								0	0
Long-term Debt, Current Maturities	0		0		0
Debt, carrying value	1,078,366,000		1,078,366,000		1,073,472,000
Debt, fair value	972,100,000		972,100,000
Capitalized interest, approximate amount	$ 6,100,000	$ 9,000,000	$ 11,900,000	$ 17,700,000

Incentive Compensation - Additional Information (Detail)	6 Months Ended								0 Months Ended
	Jun. 30, 2015	Jun. 30, 2015 Minimum	Jun. 30, 2015 Maximum	Jun. 30, 2015 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2015 Performance Based Restricted Stock	Jun. 30, 2015 Time Based Restricted Stock Maximum	Jun. 30, 2015 Cash Settled Restricted Stock Units [Member] Restricted Stock Units (RSUs) [Member]	Jun. 30, 2015 Amended Maximum number of shares available [Member]	Jun. 18, 2015 Additional shares to be authorized2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards depending on the performance goals		0.00%	150.00%
Share awards granted in period				353,940			42,692
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				21,737
Vesting Period (in years)					3 years	3 years
Stock-based incentive compensation plan, maximum number of shares covered								4,950,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	4,047,682
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized									750,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period				258,912

Financial Impact of Stock-Based Compensation Expense (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Income before taxes	$ 2,802	$ 3,685	$ 4,774	$ 6,316
Net income	$ 1,776	$ 2,298	$ 3,001	$ 3,946
Earnings per share:
Basic earnings per common share, dollars per share	$ 0.05	$ 0.06	$ 0.08	$ 0.11
Diluted earnings per common share, dollars per share	$ 0.05	$ 0.06	$ 0.08	$ 0.11

Commitments and Contingencies - Additional Information (Detail) (USD $)		12 Months Ended		1 Months Ended	6 Months Ended			1 Months Ended				6 Months Ended
	Jun. 30, 2015	Dec. 31, 2013 Unfavorable Regulatory Action Brazil Vessel	Jun. 30, 2015 Unfavorable Regulatory Action Brazil	Nov. 30, 2011 Newbuild program #5 Vessel Shipyard Program	Jun. 30, 2015 Newbuild program #5 Vessel	Jun. 30, 2015 Newbuild program #5 Fiscal Year 2015 Vessel	Jun. 30, 2015 Newbuild program #5 Fiscal Year 2016 Vessel	Nov. 30, 2011 Offshore Supply Vessel Class 300 Newbuild program #5 Vessel	Nov. 30, 2011 Offshore Supply Vessel Class 310 Newbuild program #5 Vessel	Nov. 30, 2011 Offshore Supply Vessel Class 320 Newbuild program #5 Vessel	Nov. 30, 2011 Multi Purpose Supply Vessel Class 310 Vessel Newbuild program #5 Vessel	Jun. 30, 2015 Multi Purpose Supply Vessel Class 310 Vessel Newbuild program #5 Vessel	Jun. 30, 2015 Petrobas [Member] Brazil
Gain Contingencies [Line Items]
Number Of Construction Shipyards, Domestic				3
Number of vessels to be constructed					7			4	5	10	5
Number of Vessels Placed in Service												17
Number Of Vessels				24		3	4
Aggregate cost of OSV newbuild program excluding construction period interest					$ 1,265,000,000
Cost incurred on OSV newbuild program					1,141,700,000
Percentage of total project cost					90.30%
Company's exposure to claims, net of amount accrued, low range			500,000.0										500,000
Company's exposure to claims, net of amount accrued, high range			3,500,000										3,000,000
Amount owed by ATP	4,800,000
Amount owed by ATP, reserves	900,000
Number Of Ship Construction Programs				5
Number of Vessels operating in Brazil		4
Estimated Construction Cost, Remainder of Fiscal Year Two					68,400,000
Estimated Construction Cost, Remainder of Fiscal Year Three					$ 54,900,000

Recent Accounting Pronouncements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2015
Recent Accounting Pronouncements [Abstract]
Deferred Finance Costs, Noncurrent, Net	$ 14.6

Long-Term Debt Cash Interest Payments on Long-Term Debt (Details) (Subsequent Event [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Oct. 01, 2015 Senior Notes 5.875 Percent Due 2020	Sep. 02, 2015 Senior Notes 5.000 Percent Due 2021	Sep. 02, 2015 Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Semi-Annual Cash Interest Payment	$ 11,000	$ 11,300	$ 2,300