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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, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
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Variable Interest Entity |  |  |  |
Cash and cash equivalents | $ 1,179,644,000 | $ 814,663,000 | $ 1,308,733,000 | $ 309,766,000
Accounts receivable, net | 293,765,000 | 349,218,000 |  |
Prepaid expenses | 13,567,000 | 39,253,000 |  |
Other current assets | 25,823,000 | 21,831,000 |  |
Total current assets | 1,525,945,000 | 1,241,823,000 |  |
Other property, plant and equipment, net | 559,342,000 | 566,222,000 |  |
Accounts payable and accrued expenses | 581,764,000 | 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 |  |

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