Document and Entity Information. Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Statement Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus CONDENSED CONSOLIDATED BALANCE SHEETS Assets. ASSETS Assets, Current [Abstract] CURRENT ASSETS: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents CASH AND CASH EQUIVALENTS Accounts Receivable, Net, Current Due from charterers, net Due from Related Parties, Current Due from Navig8 pools, net Assets Held-for-sale, Not Part of Disposal Group, Current Assets held for sale Derivative Asset, Current Derivative financial instruments - current Fair value of derivative - current assets Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Total Assets, Current Total current assets Assets, Noncurrent [Abstract] NONCURRENT ASSETS: Long lived, depreciable assets used for the primary purpose of water transportation, net of accumulated depreciation. Vessels, Net Vessels, net of accumulated depreciation of $239,136 and $221,646, respectively Amount after accumulated depreciation, depletion and amortization of physical assets excluding vessels used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Property Plant And Equipment Excluding Vessels Other fixed assets, net Carrying amount, net of accumulated amortization, as of the balance sheet date of capitalized drydock costs performed pursuant to regulatory requirements that are expected to be recovered over the period between drydockings, typically over periods from 2.5 to 5 years. Deferred Drydock Costs Net Deferred drydock costs, net Represents the non-current vessel pool working capital. Working Capital In Vessel Pool Non Current Working capital at Navig8 pools Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Derivative Asset, Noncurrent Derivative financial instruments - non-current Fair value of derivative - noncurrent assets Other Assets, Noncurrent Other noncurrent assets Total Assets, Noncurrent Total noncurrent assets Assets TOTAL ASSETS Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] CURRENT LIABILITIES: Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued expenses Total Amount of non current portion of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Long-Term Debt Current Gross Less: current portion of long-term debt Long-term debt, current portion Amount of current portion of unamortized debt discount (premium) and debt issuance costs. Debt Instrument Unamortized Discount Premium and Debt Issuance Costs, Current, Net Less unamortized discount and debt financing costs Long-term Debt, Current Maturities Long-term debt, current portion less unamortized discount and debt financing costs Derivative Liability, Current Fair value of derivative - current liabilities Derivative financial instruments - current Liabilities, Current Total current liabilities Liabilities, Noncurrent [Abstract] NONCURRENT LIABILITIES: Amount of non current portion of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Long-term Debt Noncurrent, Gross Long-term debt Amount of non-current portion of unamortized debt discount (premium) and debt issuance costs. Debt Instrument Unamortized Discount Premium and Debt Issuance Costs, Non-Current, Net Less unamortized discount and debt financing costs Long-term Debt, Excluding Current Maturities Long-term debt less unamortized discount and debt financing costs Other Liabilities, Noncurrent Other noncurrent liabilities Liabilities, Noncurrent Total noncurrent liabilities Liabilities TOTAL LIABILITIES Commitments and Contingencies COMMITMENTS AND CONTINGENCIES Stockholders' Equity Attributable to Parent [Abstract] SHAREHOLDERS' EQUITY: Common Stock, Value, Issued Common stock, $0.01 par value per share; authorized 225,000,000 shares; issued and outstanding 83,267,426 shares at March 31, 2018 and December 31, 2017 Preferred Stock, Value, Issued Preferred stock, $0.01 par value per share; authorized 5,000,000 shares; issued and outstanding 0 shares at March 31, 2018 and December 31, 2017 Additional Paid in Capital Paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Stockholders' Equity Attributable to Parent Balance Balance Total shareholders' equity Liabilities and Equity TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY The cumulative amount of depreciation (related to Vessels) that has been recognized from the date on which the Vessels were acquired through the balance sheet date. Accumulated Depreciation Vessels Vessels, accumulated depreciation Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, authorized shares Common Stock, Shares, Issued Common stock, issued shares Common Stock, Shares, Outstanding Common stock, outstanding shares Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, outstanding shares Preferred stock, outstanding shares CONSOLIDATED STATEMENTS OF OPERATIONS No definition available. Revenue from Contract with Customer, Net [Abstract] VOYAGE REVENUES: Revenues Revenues Costs and Expenses [Abstract] OPERATING EXPENSES: Expenses associated with operating vessels which are attributable to particular voyages such as fuel costs, port costs, broker commissions and canal tolls. Voyage Expenses Voyage expenses Direct Operating Costs Direct vessel operating expenses Represents the charterhire expenses (income credit) for a subsidiary or related party included in cost of sales and operating expenses. Charterhire Expense Income Navig8 charterhire expenses General and Administrative Expense. General and administrative expenses Depreciation, Depletion and Amortization Depreciation and amortization Gain (Loss) on Disposition of Assets Loss on disposal of vessels, net Loss on disposal of vessels, net Costs and Expenses Total operating expenses Operating Income (Loss) OPERATING (LOSS) / INCOME Nonoperating Income (Expense) [Abstract] OTHER EXPENSES: Interest Expense Interest expense, net Interest expense, net (where the effects of fair value or cash flow hedges are recorded) Amount of other debt issuance costs (for example, but not limited to, other legal, accounting, broker, and regulatory fees). Other Debt Issuance Costs Other financing costs Other Nonoperating Income (Expense) Other (expense) income, net Nonoperating Income (Expense) Total other expenses Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) NET (LOSS) / INCOME Net (loss) / income (LOSS) / INCOME PER COMMON SHARE (LOSS) / INCOME PER COMMON SHARE: Earnings Per Share, Basic Basic (in dollars per share) Basic net (loss) / income per share (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Diluted net (loss) / income per share (in dollars per share): CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive (loss) income: Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Amount recognized in other comprehensive income (loss) on derivative Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Amount reclassified from AOCI to net (loss) / income on derivative Amount reclassified from AOCI to net (loss)/ income on derivative Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive (loss) income CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid In Capital [Member] Paid-In Capital Retained Earnings [Member] Accumulated Deficit Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Shareholders' Equity Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net (loss) / income Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net (loss) / income to net cash provided by operating activities: Gain Loss On Disposal Of Vessel And Vessel Equipment Loss on disposal of vessels, net Paid-in-Kind Interest Payment-in-kind interest expense Amortization of Financing Costs Amortization of deferred financing costs and senior notes Unrealized Gain (Loss) on Derivatives Net unrealized gain on derivative financial instrument Share-based Compensation Stock-based compensation expense Provision for Doubtful Accounts Provision for bad debts Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts Receivable Increase in due from charterers Related Party Increase Decrease In Accounts Receivable Decrease in due from Navig8 pools Increase (Decrease) in Prepaid Expense and Other Assets (Increase) decrease in prepaid expenses and other current and noncurrent assets Represents the increase (decrease) of working capital of subsidiary vessel pools. Increase Decrease In Working Capital Of Subsidiary Pools Decrease (increase) in working capital at Navig8 pools Increase (Decrease) in Accounts Payable and Accrued Liabilities Decrease in accounts payable and other current and noncurrent liabilities Amounts paid for drydock costs performed pursuant to regulatory requirements. The amount paid for drydock is amortized over the period until the next drydock. Deferred Drydock Costs Incurred Deferred drydock costs incurred Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: The cash outflow for payments for vessels under construction. Payments To Acquire Vessels Under Construction Payments for vessels under construction Interest Paid, Capitalized Payment of capitalized interest The net cash inflow from the sale of vessels. Proceeds From Sale Of Vessels Proceeds from sale of vessels, net Proceeds from Insurance Settlement, Investing Activities Proceeds from insurance claims The cash outflow for acquisition of capital improvements on vessels and other fixed assets. Payments For Vessel Improvements And Other Fixed Assets Purchase of vessel improvements and other fixed assets Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from Issuance of Long-term Debt Borrowings under credit facilities Repayments of Long-term Debt Repayments of credit facilities Payments of Financing Costs Deferred financing costs paid Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash (used in) provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, end of period CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION - Interest Paid, Net Cash paid during the period for interest, net of capitalized interest Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Reconciliation of the cash, cash equivalents, and restricted cash balances Restricted Cash and Cash Equivalents RESTRICTED CASH BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES MERGER AGREEMENT Business Combination Disclosure [Text Block] MERGER AGREEMENT Earnings Per Share [Text Block] (LOSS) / INCOME PER COMMON SHARE ASSETS HELD FOR SALE Property, Plant, and Equipment and Intangible Assets [Text Block] ASSETS HELD FOR SALE CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] CASH FLOW INFORMATION PREPAID EXPENSES AND OTHER CURRENT ASSETS Disclosure of all information related to prepaid expenses and other current assets. Prepaid Expenses And Other Current Assets Disclosure [Text Block] PREPAID EXPENSES AND OTHER CURRENT ASSETS OTHER NONCURRENT ASSETS Other Assets Disclosure [Text Block] OTHER NONCURRENT ASSETS ACCOUNTS PAYABLE AND ACCRUED EXPENSES Accounts Payable and Accrued Liabilities Disclosure [Text Block] ACCOUNTS PAYABLE AND ACCRUED EXPENSES LONG-TERM DEBT Long-term Debt [Text Block] LONG-TERM DEBT FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] FINANCIAL INSTRUMENTS FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] FAIR VALUE OF FINANCIAL INSTRUMENTS LEASE COMMITMENTS Commitments Disclosure [Text Block] LEASE COMMITMENTS RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] RELATED PARTY TRANSACTIONS STOCK-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] STOCK-BASED COMPENSATION COMMITMENTS AND CONTINGENCIES. Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES SUBSEQUENT EVENTS Subsequent Events [Text Block] SUBSEQUENT EVENTS Basis of Accounting, Policy [Policy Text Block] BASIS OF PRESENTATION Disclosure of accounting policy for going concern. Going Concern [Policy Text Block] GOING CONCERN Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of reconciliation of basic to diluted (loss) / income per common share Schedule of Other Current Assets [Table Text Block] Schedule of prepaid expenses and other current assets Schedule of other noncurrent assets Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Schedule of accounts payable and accrued expenses Schedule of Long-term Debt Instruments [Table Text Block] Schedule of long-term debt Schedule of Other Nonoperating Income, by Component [Table Text Block] Schedule of Interest expense, net Schedule of Derivative Instruments [Table Text Block] Schedule of derivative instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of quantitative information about the impact of derivatives on the Company’s balance sheet and statement of operations Offsetting Assets [Table Text Block] Schedule of offsetting of derivative assets Tabular disclosure for fair value and cash flow hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. Schedule of Fair Value And Cashflow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of fair value and cash flow hedge accounting on the statements of operations Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of effect of derivatives on the statements of operations Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of estimated fair values of financial instruments Fair Value Measurements, Nonrecurring [Table Text Block] Schedule of valuation of financial instruments on a nonrecurring basis Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Schedule of valuation of liabilities measured on a recurring basis Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of certain information of the stock options granted Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Summary of RSU activity Information related to various accounting policies of the entity. Summary Of Significant Accounting Policies [Table] Information by type of vessel. Vessel By Type [Axis] Type of vessel. Vessel Type [Domain] Vessel Type [Domain] Represents Information pertaining to Very Large Crude Carriers ("VLCCs"). Very Large Crude Carriers [Member] VLCCs Represents Information pertaining to Suezmax tankers. Suezmax Vessel [Member] Suezmax tankers Represents Information pertaining to Aframax tankers. Aframax Vessel [Member] Aframax Represents Information pertaining to Panamax tankers. Panamax Vessel [Member] Panamax tankers Line items represent financial concepts included in a table for significant accounting policies. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies No definition available. Nature Of Business [Abstract] NATURE OF BUSINESS Represents the number of vessels. Number Of Vessels Number of tankers