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SHARE REPURCHASE PROGRAM (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Feb. 13, 2008	Dec. 31, 2012
SHARE REPURCHASE PROGRAM
Amount approved under share repurchase program	$ 50,000
Shares of common stock repurchased and retired		278,300
Value of shares of common stock repurchased and retired		$ 11,500

X

- Definition

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

+ References

No definition available.

+ Details

Name:	gnk_CumulativeStockRepurchasedAndRetiredDuringPeriodShares
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

- Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration