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SAVINGS PLAN (Details) - USD ($)	6 Months Ended		12 Months Ended
	Dec. 31, 2014	Jul. 09, 2014	Dec. 31, 2016	Dec. 31, 2015
Employer's dollar contribution for each employee percent to the 401(k) plan			$ 1.17
Employer's matching contribution (as a percent)			6.00%
Employer's matching contribution	$ 181,000		$ 336,000	$ 305,000
Predecessor
Employer's matching contribution		$ 131,000

X

- Definition

Amount which the employer contributes for each dollar contributed of employees' gross pay to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: