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Variable Interest Entities - Grey Ranch, L.P. - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Variable Interest Entity        
Cash and cash equivalents $ 918,758,000 $ 814,663,000 $ 1,094,341,000 $ 309,766,000
Accounts receivable, net 333,300,000 349,218,000    
Prepaid expenses 12,337,000 39,253,000    
Other current assets 21,671,000 21,831,000    
Total current assets 1,289,616,000 1,241,823,000    
Other property, plant and equipment, net 564,521,000 566,222,000    
Accounts payable and accrued expenses 631,658,000 812,488,000    
Grey Ranch Plant, L.P
        
Variable Interest Entity        
Cash and cash equivalents   132,000    
Accounts receivable, net   16,000    
Prepaid expenses   32,000    
Other current assets   109,000    
Total current assets   289,000    
Other property, plant and equipment, net   1,163,000    
Total assets   1,452,000    
Accounts payable and accrued expenses   129,000    
Total liabilities   $ 129,000