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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 |  |

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