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SHARE REPURCHASE PROGRAM (Details) (Predecessor, USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jul. 09, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 13, 2008
Predecessor
Amount approved under share repurchase program				$ 50,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Shares of common stock repurchased and retired	278,300gnk_CumulativeSharesRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Value of common stock repurchased and retired	$ 11,500gnk_CumulativeStockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Common stock repurchased (in shares)	0us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	0us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	0us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X

- Definition

Cumulative number of shares that have been repurchased and retired during the period.

+ References

No definition available.

+ Details

Name:	gnk_CumulativeSharesRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix:	gnk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cumulative equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

No definition available.

+ Details

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

X

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

Name:	us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant