Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (79,115)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	19,410
Amortization of deferred financing costs	487us-gaap_AmortizationOfFinancingCosts
Amortization of nonvested stock compensation expense	12,360us-gaap_ShareBasedCompensation
Impairment of vessel assets	35,396us-gaap_AssetImpairmentCharges
Change in assets and liabilities:
Decrease in due from charterers	2,373
Increase in prepaid expenses and other current assets	(3,504)
Increase in accounts payable and accrued expenses	3,163
Increase (decrease) in deferred revenue	440
Increase in lease obligations	203
Deferred drydock costs incurred	(3,533)gnk_DeferredDrydockCostsIncurred
Net cash used in operating activities	(12,320)
Cash flows from investing activities:
Purchase of vessels, including deposits	(24,104)
Purchase of other fixed assets	(56)
Changes in deposits of restricted cash	19,645
Net cash used in investing activities	(4,515)
Cash flows from financing activities:
Cash settlement of non-accredited Note holders	(49)
Payment of deferred financing costs	(2,220)us-gaap_PaymentsOfFinancingCosts
Net cash provided by (used in) financing activities	2,204
Net decrease in cash and cash equivalents	(14,631)
Cash and cash equivalents at beginning of period	83,414
Cash and cash equivalents at end of period	68,783
Predecessor
Cash flows from operating activities:
Net loss		(42,238)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		36,201
Amortization of deferred financing costs		2,220
Amortization of time charters acquired		(49)
Amortization of discount on Convertible Senior Notes		1,299
Amortization of nonvested stock compensation expense		1,390
Change in assets and liabilities:
Decrease in due from charterers		2,803
Increase in prepaid expenses and other current assets		(7,210)
Increase in accounts payable and accrued expenses		8,558
Increase (decrease) in deferred revenue		(9)
Increase in lease obligations		100
Deferred drydock costs incurred		(5,669)
Net cash used in operating activities		(2,604)
Cash flows from investing activities:
Purchase of vessels, including deposits		(17,618)
Purchase of other fixed assets		(179)
Changes in deposits of restricted cash		(125)
Net cash used in investing activities		(17,922)
Cash flows from financing activities:
Payment of dividend by subsidiary		(1,534)
Payment of common stock issuance costs by subsidiary		(106)
Payment of deferred financing costs		(88)
Net cash provided by (used in) financing activities		(9,788)
Net decrease in cash and cash equivalents		(30,314)
Cash and cash equivalents at beginning of period		122,722
Cash and cash equivalents at end of period		92,408
$100 Million Term Loan Facility
Cash flows from financing activities:
Repayments on Term Loan Facility	(1,923)
$100 Million Term Loan Facility \| Predecessor
Cash flows from financing activities:
Repayments on Term Loan Facility		(1,923)
$253 Million Term Loan Facility
Cash flows from financing activities:
Repayments on Term Loan Facility	(5,292)
$253 Million Term Loan Facility \| Predecessor
Cash flows from financing activities:
Repayments on Term Loan Facility		(5,075)
Baltic Trading $148 Million Credit Facility
Cash flows from financing activities:
Proceeds from credit facility	115,000
2010 Baltic Trading Credit Facility
Cash flows from financing activities:
Repayments on Term Loan Facility	(102,250)
Baltic Trading $22 Million Term Loan Facility
Cash flows from financing activities:
Repayments on Term Loan Facility	(375)
Baltic Trading $22 Million Term Loan Facility \| Predecessor
Cash flows from financing activities:
Repayments on Term Loan Facility		(375)
Baltic Trading $44 Million Term Loan Facility
Cash flows from financing activities:
Repayments on Term Loan Facility	(687)
Baltic Trading $44 Million Term Loan Facility \| Predecessor
Cash flows from financing activities:
Repayments on Term Loan Facility		$ (687)

Amounts paid for drydock costs performed pursuant to regulatory requirements.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=gnk_SecuredTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=gnk_TermLoanFacilityFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: