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SHARE REPURCHASE PROGRAM (Details) (Predecessor, USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	9 Months Ended
	Jul. 09, 2014	Sep. 30, 2013
Predecessor
Shares of common stock repurchased and retired	278,300
Value of common stock repurchased and retired	$ 11,500
Common stock repurchased (in shares)	0	0

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