Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable Current Accounts payable Accounts Receivable Net Current Accounts receivable, net of allowance for doubtful accounts of $2,887 and $3,028, respectively Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive loss Additional Paid In Capital Additional paid-in-capital Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Allowance For Doubtful Accounts Receivable Current Accounts receivable, allowance for doubtful accounts Amended and Restated Credit Agreement [Member] Amended And Restated Credit Agreement [Member] Amended and Restated Credit Agreement Amended Line of Credit Facility [Member] Amended Line Of Credit Facility [Member] Amended Line of Credit Facility Amendment Flag Amendment Flag Amortization Of Deferred Charges Amortization Amortization Of Financing Costs Amortization of deferred financing costs Assets Assets Total assets Assets [Abstract] ASSETS Assets Current Total current assets Assets Current [Abstract] Current assets: B R Brazil Cash And Cash Equivalents At Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Net increase in cash and cash equivalents Cash Settled Restricted Stock Units [Member] Cash Settled Restricted Stock Units [Member] Cash Settled Restricted Stock Units Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Line Items] Commitments And Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Text Block] Contingencies Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock, shares issued Common Stock Shares Outstanding Common stock, shares outstanding Common Stock Value Common stock: $0.01 par value; 100,000 shares authorized; 35,786 and 35,479 shares issued and outstanding, respectively Comprehensive Income Net Of Tax Total comprehensive income Construction In Progress Construction In Progress Construction-in-progress Convertible One Point Five Percent Senior Notes Due Twenty Nineteen [Member] Convertible One Point Five Percent Senior Notes Due Twenty Nineteen [Member] Convertible 1.500 Percent Senior Notes Due 2019 Convertible 1.625 Percent Senior Notes Due 2026 [Member] Convertible One Point Six Two Five Percent Senior Notes Due Twenty Twenty Six [Member] Convertible 1.625 Percent Senior Notes Due 2026 Corporate [Member] Corporate Costs And Expenses Costs and Expenses, Total Costs And Expenses [Abstract] Costs and expenses: Costs Incurred For Offshore Supply Vessels Newbuild Program. Costs Incurred For Offshore Supply Vessels Newbuild Program Costs incurred for OSV newbuild program #5 Current Fiscal Year End Date Current Fiscal Year End Date Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument Basis Spread On Variable Rate Debt instrument, margin rate Convertible Debt Instrument Optional Repurchase Date. Debt Instrument Convertible Optional Repurchase Dates Convertible senior notes, feature purchase date Debt Instrument Date Of Payment Debt Instrument Date Of Payment Debt instrument, interest payable date Subject to certain conversion and redemption features of the convertible senior notes, holders of such notes may require the Company to purchase all or a portion of their notes on each of November 15, 2013, November 15, 2016 and November 15, 2021. Debt Instrument Exchange Description Conversion and redemption features of the convertible senior notes Debt Instrument Face Amount Debt instrument, principal amount Debt Instrument, Face Amount, Repaid Debt Instrument Face Amount Repaid Repaid amount of senior notes Debt Instrument Fair Value Debt, fair value Debt Instrument Frequency Of Periodic Payment Debt instrument, frequency of periodic payment Debt Instrument Interest Rate Effective Percentage Debt instrument, effective interest rate Debt Instrument Interest Rate Stated Percentage Debt instrument, interest rate Interest Rate Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument Maturity Date Debt instrument, maturity date Debt Instrument, Maturity, Month and Year Debt Instrument Maturity Month And Year Debt Instrument, Maturity, Month and Year Debt Instrument Maturity Year Debt Instrument Maturity Year Debt instrument, maturity year Maturity Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Debt Instrument Periodic Payment Interest Semi annual interest payments Debt Instrument [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument Unamortized Discount Long-term debt, original issue discount Senior notes, original issue discount Debt Instrument, Unamortized Discount, Current Debt Instrument Unamortized Discount Current Current portion of long-term debt, original issue discount Debt Outstanding, Type [Axis] Debt Outstanding Type [Axis] Debt Outstanding, Type [Axis] Debt Outstanding, Type [Domain] Debt Outstanding Type [Domain] Debt Outstanding, Type [Domain] Debt Redemption Price Percent Of Par Debt Redemption Price Percent Of Par Senior notes, redemption price percentage of par Deferred Costs Deferred charges, net Deferred Income Taxes And Other Assets Current Deferred tax assets, net Deferred Income Tax Expense Benefit Deferred tax expense Deferred Loss On Early Extinguishment Of Debt [Member] Deferred Loss on Early Extinguishment of Debt Deferred Revenue Current Deferred revenue Deferred Tax Liabilities Noncurrent Deferred tax liabilities, net Depreciation Depreciation Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Incentive Compensation Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Domestic [Member] Domestic [Member] Domestic Downstream [Member] Downstream [Member] Downstream Earnings Per Share [Abstract] Earnings per common share: Earnings Per Share Basic Basic Basic earnings per common share Earnings Per Share Diluted Diluted Diluted earnings per common share Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share Reconciliation [Abstract] Earnings Per Share Reconciliation [Abstract] Earnings Per Share [Text Block] Earnings Per Share Effect Of Exchange Rate On Cash And Cash Equivalents Effects of exchange rate changes on cash Employee Related Liabilities Current Accrued payroll and benefits Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Excess Tax Benefit From Share Based Compensation Financing Activities Tax shortfall from share-based payments Foreign [Member] Foreign [Member] Foreign Gain Loss On Disposition Of Assets Gain on sale of assets Gain on sale of assets Gains Losses On Extinguishment Of Debt Loss on early extinguishment of debt Loss on early extinguishment of debt General And Administrative Expense General and administrative expenses Holder Optional Redemption Period 1 [Member] Holder Optional Redemption Period One [Member] Holder Optional Redemption Period 1 Holder Optional Redemption Period 3 [Member] Holder Optional Redemption Period Three [Member] Holder Optional Redemption Period 3 Holder Optional Redemption Period 2 [Member] Holder Optional Redemption Period Two [Member] Holder Optional Redemption Period 2 Incentive Compensation Plans Expense Recognized in Earnings Incentive Compensation Plans Expense Recognized In Earnings [Text Block] Financial Impact of Stock-Based Compensation Expense Charges Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income before taxes Income before income taxes Income Statement [Abstract] Income Statement [Abstract] Income Taxes Paid Cash paid for income taxes Income Tax Expense Benefit Income tax expense Increase Decrease In Accounts Payable Accounts payable Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Liabilities And Other Operating Liabilities Accrued liabilities and other liabilities Increase Decrease In Deferred Charges Deferred drydocking charges Increase Decrease In Interest Payable Net Accrued interest Increase Decrease In Operating Capital [Abstract] Changes in operating assets and liabilities: The net change during the reporting period in other current receivables and other current assets. Increase Decrease In Other Current Receivables And Other Current Assets Other receivables and current assets Interest Costs Capitalized Capitalized interest, approximate amount Interest Expense Interest expense Interest Paid Cash paid for interest Interest Payable Current Accrued interest Investment Income Interest Interest income Legal Entity [Axis] Legal Entity [Axis] Letter Of Credit [Member] Letter of Credit Liabilities Total liabilities Liabilities And Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities Current Total current liabilities Liabilities Current [Abstract] Current liabilities: Line Of Credit Letter of credit Revolving credit facility Line Of Credit Facility [Axis] Lender Name [Axis] Line Of Credit Facility Current Borrowing Capacity Revolving credit facility, current borrowing capacity Line Of Credit Facility Interest Rate Description Revolving credit facility interest and fee Line Of Credit Facility Lender [Domain] Line of Credit Facility, Lender [Domain] Line Of Credit Facility Maximum Borrowing Capacity Revolving credit facility, maximum borrowing capacity Line Of Credit Facility Unused Capacity Commitment Fee Percentage Line of credit facility, commitment fee percentage Long Term Debt Debt, carrying value Long Term Debt Current Current portion of long-term debt, net of original issue discount of $8,114 and $11,093, respectively Less current maturities Long Term Debt Noncurrent Long-term Debt, Excluding Current Maturities Long-term debt, net of original issue discount of $67,608 and $74,470, respectively Long Term Debt [Text Block] Long-Term Debt Longterm Debt Type [Axis] Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Long-term Debt, Type [Domain] Loss Contingency Estimate Of Possible Loss Amount owed by ATP Loss Contingency, Estimate of Possible Loss, Related Reserves Loss Contingency Estimate Of Possible Loss Related Reserves Amount owed by ATP, reserves Loss Contingency Range Of Possible Loss Maximum Company's exposure to claims, net of amount accrued, high range Loss Contingency Range Of Possible Loss Minimum Company's exposure to claims, net of amount accrued, low range Maximum [Member] Maximum Minimum [Member] Minimum Net Cash Provided By Used In Financing Activities Net cash provided by financing activities Net Cash Provided By Used In Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided By Used In Investing Activities Net cash used in investing activities Net Cash Provided By Used In Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided By Used In Operating Activities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Income Loss Net income Net income Nonoperating Income Expense Nonoperating Income (Expense), Total Nonoperating Income Expense [Abstract] Other income (expense): Number Of Operating Segments Number of business segments Number of Vessels Mobilized Number Of Vessels Mobilized Number of vessels mobilized to Brazil to operate under long term contracts for Petrobras One Month LIBOR [Member] One Month London Interbank Offered Rate [Member] One Month LIBOR Operating Costs And Expenses Operating expenses Operating Income Loss Operating income Operating income Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Basis of Presentation Other Accrued Liabilities Current Other accrued liabilities Other Assets Current Other current assets Other Assets Noncurrent Other assets Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Foreign currency translation gain (loss) Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income, net of tax: Other Liabilities Noncurrent Other liabilities Other Nonoperating Income Expense Other income (expense), net The premium paid in connection with the early extinguishment of debt. Payment Of Premiums For Debt Extinguishment Premium on the retirement of debt Payments Of Financing Costs Deferred financing costs Payments Of Stock Issuance Costs Payments for public offering of common stock Payments To Acquire Other Property Plant And Equipment Non-vessel capital expenditures Payments To Acquire Productive Assets Capital expenditures Payments To Acquire Property Plant And Equipment Vessel capital expenditures Percentage of Notes Redeemed Percentage Of Notes Redeemed Percentage of debt outstanding tendered Percentage Thresholds For Potential Shares To Be Issued Percentage Thresholds For Potential Shares To Be Issued Share awards depending on the performance goals Performance Based Restricted Stock [Member] Performance Based Restricted Stock [Member] Performance Based Restricted Stock Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Preferred Stock Par Or Stated Value Per Share Preferred stock, par value Preferred Stock Shares Authorized Preferred stock, shares authorized Preferred Stock Shares Issued Preferred stock, shares issued Preferred Stock Shares Outstanding Preferred stock, shares outstanding Preferred Stock Value Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding Prime Rate or Federal Funds Rate [Member] Prime Rate Or Federal Funds Rate [Member] Prime Rate or Federal Funds Rate Proceeds From Issuance Of Senior Long Term Debt Net proceeds from issuance of senior notes Proceeds from the issuance of senior notes Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options Net cash proceeds from other shares issued Proceeds From Sale Of Property Plant And Equipment Net proceeds from sale of assets Property Plant And Equipment Net Property, plant and equipment, net Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected), net of recoveries. Provision And Recovery For Doubtful Accounts Provision for bad debts Range [Axis] Range [Axis] Range [Member] Range [Domain] Registration Rights Agreement Date Registration Rights Agreement Date Registration right agreement date Repayments Of Senior Debt Repayment of senior notes Repayment of senior notes Retained Earnings Accumulated Deficit Retained earnings Revenues Revenues Revolving Credit Facility Maturing Twenty Sixteen [Member] Revolving Credit Facility Maturing Twenty Sixteen [Member] Revolving Credit Facility Due 2016 Scenario Adjustment [Member] Beginning on November 15, 2013 Scenario Unspecified [Domain] Scenario, Unspecified [Domain] Schedule Of Debt Instruments [Text Block] Outstanding Long-Term Debt Schedule Of Earnings Per Share Reconciliation Table [Text Block] Reconciliation of Earnings Per Share