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Commitments and Contingencies (Details)
1 Months Ended
Sep. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Mar. 31, 2009
GTL Injunction - FG Hemisphere [Member]
USD ($)
Oct. 31, 2010
GTL Injunction - Marange [Member]
EUR (€)
Mar. 31, 2009
GTL [Member]
Site Contingency [Line Items]          
Percentage of interest in joint venture by the company         55.00%
Amounts under injunction     $ 108,300,000 € 14,500,000  
Amount of Arbitration Awards accrued $ 22,791,000 $ 92,813,000