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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 |  |  |  | $ 50,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Shares of common stock repurchased and retired | 278,300 gnk_CumulativeSharesRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Value of common stock repurchased and retired | $ 11,500 gnk_CumulativeStockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Common stock repurchased (in shares) | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-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

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- 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

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- 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