Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Other noncurrent assets $ 33,169,000 $ 18,895,000
Restricted net assets of consolidated subsidiaries 1,636,800,000  
Bechtel EPC Contract - Train 1 and 2
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Oil and Gas Delivery Commitments and Contracts, Contract Price 3,900,000,000  
Bechtel EPC Contract - Train 1 and 2 | Maximum [Member]
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Lump sum payment, termination prior to issuance of notice to proceed 30,000,000  
Bechtel EPC Contract - Train 3 and 4
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Oil and Gas Delivery Commitments and Contracts, Contract Price 3,800,000,000  
Lump sum payment, termination after issuance of notice to proceed 30,000,000  
Long-term Purchase Commitment, Amount 5,000,000  
Bechtel EPC Contract - Train 3 and 4 | Minimum [Member]
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Lump sum payment, termination prior to issuance of notice to proceed 1,000,000  
Bechtel EPC Contract - Train 3 and 4 | Maximum [Member]
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Lump sum payment, termination prior to issuance of notice to proceed 2,500,000  
Crest Royalty [Member]
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Other noncurrent assets 13,200,000  
Interest payment period 20 years  
Crest Royalty [Member] | Minimum [Member]
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Long-term Purchase Commitment, Amount 2,000,000  
Crest Royalty [Member] | Maximum [Member]
    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Long-term Purchase Commitment, Amount $ 11,000,000