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Variable Interest Entities - Grey Ranch, L.P. - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Variable Interest Entity |  |  |  |
Cash and cash equivalents | $ 1,094,341 | $ 309,766 | $ 421,073 | $ 207,681
Accounts receivable, net | 412,140 | 445,506 |  |
Prepaid expenses | 38,162 | 31,319 |  |
Other current assets | 38,866 | 19,043 |  |
Total current assets | 1,641,990 | 1,142,885 |  |
Other property, plant and equipment, net | 567,910 | 582,375 |  |
Accounts payable and accrued expenses | 746,944 | 766,544 |  |
Grey Ranch Plant, L.P |  |  |  |
Variable Interest Entity |  |  |  |
Cash and cash equivalents | 226 | 1,080 |  |
Accounts receivable, net | 18 | 20 |  |
Prepaid expenses | 33 | 64 |  |
Other current assets | 109 | 109 |  |
Total current assets | 386 | 1,273 |  |
Other property, plant and equipment, net | 1,205 | 1,246 |  |
Total assets | 1,591 | 2,519 |  |
Accounts payable and accrued expenses | 137 | 274 |  |
Total liabilities | $ 137 | $ 274 |  |

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