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Variable Interest Entities - Grey Ranch, L.P. - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 1,308,733,000 $ 309,766,000 $ 127,842,000 $ 207,681,000
Accounts receivable, net 389,399,000 445,506,000    
Prepaid expenses 40,159,000 31,319,000    
Other current assets 18,439,000 19,043,000    
Total current assets 1,789,158,000 1,142,885,000    
Other property, plant and equipment, net 595,511,000 582,375,000    
Accounts payable and accrued expenses 672,372,000 766,544,000    
Grey Ranch Plant, L.P
        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 883,000 1,080,000    
Accounts receivable, net 18,000 20,000    
Prepaid expenses 45,000 64,000    
Other current assets 109,000 109,000    
Total current assets 1,055,000 1,273,000    
Other property, plant and equipment, net 1,225,000 1,246,000    
Total assets 2,280,000 2,519,000    
Accounts payable and accrued expenses 982,000 274,000    
Total liabilities $ 982,000 $ 274,000