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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Vessels, net |  |  |  |  |
Estimated useful life |  |  | 25 years |  |
Depreciation expense | $ 33,102 | $ 33,094 | $ 65,841 | $ 66,185 |
Estimated scrap value (in dollars per lightweight ton) |  |  | 245 |  |
Deferred revenue |  |  |  |  |
Accrual related to estimated customer claims | 329 |  | 329 |  | 407
Voyage expense recognition |  |  |  |  |
Net (losses) gains on purchase and sale of bunker fuel | $ (21) | $ 704 | $ 343 | $ 1,424 |
Baltic Trading Limited |  |  |  |  |
Noncontrolling interest |  |  |  |  |
Economic interest held by noncontrolling interest (as a percent) | 80.32% |  | 80.32% |  | 75.22%
Voting power (as a percent) | 21.39% |  | 21.39% |  | 16.83%

X
- Definition Represents the accrual related to estimated customer claims. + References No definition available. + Details
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Balance Type: | credit
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X
- Definition Represents the depreciation of vessels. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the voting interest held by noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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X
- Details
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- Definition Represents the estimated scrap value of vessels. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Represents the estimated useful life of vessels. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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- Details
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- Details
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Period Type: | duration

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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