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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Percentage of gross shipping income attributable to transportation beginning or ending in the U.S. will be subject to a 4% tax without allowance for deductions |  |  | 50.00% |
Percentage of tax without allowance for deductions on gross shipping income attributable to transportation beginning or ending in the U.S. |  |  | 4.00% |
Gross transportation tax | $ 167 | $ 61 | $ 380 | $ 97

X
- Definition Represents the amount of gross transportation tax. + References No definition available. + Details
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X
- Definition Represents the percentage of gross shipping income attributable to transportation beginning or ending in the U.S. will be subject to a 4% tax without allowance for deductions. + References No definition available. + Details
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Namespace Prefix: | gnk_
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of tax without allowance for deductions on gross shipping income attributable to transportation. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
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