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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended								1 Months Ended			3 Months Ended		9 Months Ended							8 Months Ended			8 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 $253 million term loan facility	Aug. 20, 2010 $253 million term loan facility vessel	Sep. 30, 2012 $100 million term loan facility	Aug. 12, 2010 $100 million term loan facility	Jun. 03, 2010 $100 million term loan facility vessel	Sep. 30, 2012 5.00% convertible senior notes	Jul. 27, 2010 5.00% convertible senior notes	Jun. 24, 2010 Master Agreement between GS&T and Bourbon vessel	Jun. 03, 2010 Purchase agreement between GS&T and Metrostar companies vessel	Mar. 29, 2011 Genco Rhone Master Agreement between GS&T and Bourbon item	Mar. 31, 2011 Genco Rhone Master Agreement between GS&T and Bourbon $253 million term loan facility	Mar. 30, 2011 Genco Rhone Master Agreement between GS&T and Bourbon $253 million term loan facility	Mar. 29, 2011 Genco Rhone Master Agreement between GS&T and Bourbon 5.00% convertible senior notes	Sep. 30, 2012 Newbuilding contract	Sep. 30, 2011 Newbuilding contract	Sep. 30, 2012 Newbuilding contract	Sep. 30, 2011 Newbuilding contract	Jun. 30, 2011 Genco Avra	May 12, 2011 Genco Avra Purchase agreement between GS&T and Metrostar companies item	Jul. 20, 2011 Genco Mare Purchase agreement between GS&T and Metrostar companies item	Dec. 31, 2011 Genco Spirit	Nov. 10, 2011 Genco Spirit Purchase agreement between GS&T and Metrostar companies item	Dec. 31, 2011 Genco Avra, Genco Mare and Genco Spirit Purchase agreement between GS&T and Metrostar companies	May 12, 2011 Genco Avra, Genco Mare and Genco Spirit Purchase agreement between GS&T and Metrostar companies	Jun. 03, 2010 Genco Avra, Genco Mare and Genco Spirit Purchase agreement between GS&T and Metrostar companies vessel	Dec. 31, 2011 Genco Avra, Genco Mare and Genco Spirit Purchase agreement between GS&T and Metrostar companies $100 million term loan facility
VESSEL ACQUISITIONS AND DISPOSITIONS
Capacity of vessels														58,000									34,400	34,400		34,400
Number of vessels purchased						13			5			13	5
Total purchase price														$ 35,700,000
Stated interest rate (as a percent)										5.00%	5.00%						5.00%
Face amount of term loan facility					253,000,000	253,000,000	100,000,000	100,000,000								253,000,000
Amount borrowed					253,000,000		100,000,000								21,500,000															60,000,000
Number of last vessels delivered pursuant to agreement																													3
Cash utilized to pay liability for vessels acquired																											29,800,000
Remaining liability for vessels acquired, before repayment																												89,800,000
Liability for time charter acquired																						372,000			205,000
Amortization of time charters acquired	187,000	463,000	558,000	1,432,000
Capitalized interest associated with newbuilding contracts																		$ 0	$ 33,000	$ 0	$ 165,000

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Represents the capacity of vessels expressed in deadweight tonnage (dwt), a measure of weight a ship is carrying or can safely carry.

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Interest rate stated in the contractual debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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