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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 12,265 | $ 45,811 | $ 67,194 | $ 91,901
Accounts receivable | 198,182 | 306,471 |  |
Inventory | 12,929 | 21,354 |  |
Prepaid expenses | 8,517 | 14,273 |  |
Other current assets | 131,757 | 330,052 |  |
Oil and gas properties (successful efforts method) | 6,337,945 | 5,966,140 |  |
Other property and equipment | 436,052 | 313,439 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,466,422) | (1,092,793) |  |
Other long-term assets | 53,883 | 55,019 |  |
Total assets | 5,725,108 | 5,938,412 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 19,505 | 20,958 |  |
Other current liabilities | 415,933 | 774,170 |  |
Long-term debt | 2,380,000 | 2,700,000 |  |
Other long-term liabilities | 619,693 | 570,983 |  |
Common stock | 1,376 | 1,001 |  |
Other stockholders’ equity | 2,308,106 |  |  |
Total stockholders’ equity | 2,309,482 | 1,872,301 |  |
Total liabilities and stockholders’ equity | 5,725,108 | 5,938,412 |  |
Parent/Issuer [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 757 | 776 | 777 | 34,277
Accounts receivable | 16 |  |  |
Accounts receivable – affiliates | 1,258 | 781 |  |
Prepaid expenses | 417 | 297 |  |
Investments in and advances to subsidiaries | 4,526,226 | 4,032,494 |  |
Other long-term assets | 227,143 | 178,752 |  |
Total assets | 4,755,817 | 4,213,100 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable – affiliates | 221,784 | 91,459 |  |
Other current liabilities | 24,551 | 49,340 |  |
Long-term debt | 2,200,000 | 2,200,000 |  |
Common stock | 1,376 |  |  |
Other stockholders’ equity | 2,308,106 |  |  |
Total stockholders’ equity |  | 1,872,301 |  |
Total liabilities and stockholders’ equity | 4,755,817 | 4,213,100 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 11,508 | 45,035 | $ 66,417 | $ 57,624
Accounts receivable | 198,166 | 306,471 |  |
Accounts receivable – affiliates | 221,784 | 91,459 |  |
Inventory | 12,929 |  |  |
Prepaid expenses | 8,100 | 13,976 |  |
Other current assets | 131,757 | 330,052 |  |
Oil and gas properties (successful efforts method) | 6,337,945 | 5,966,140 |  |
Other property and equipment | 436,052 | 313,439 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,466,422) | (1,092,793) |  |
Other long-term assets | 27,849 | 25,584 |  |
Total assets | 5,919,668 | 5,999,363 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable |  | 20,958 |  |
Accounts payable – affiliates | 1,258 | 781 |  |
Other current liabilities | 391,382 | 724,830 |  |
Long-term debt | 180,000 | 500,000 |  |
Other long-term liabilities | 820,802 | 720,300 |  |
Other stockholders’ equity | 4,526,226 |  |  |
Total stockholders’ equity |  | 4,032,494 |  |
Total liabilities and stockholders’ equity | 5,919,668 | 5,999,363 |  |
Intercompany Eliminations [Member] |  |  |  |
ASSETS |  |  |  |
Accounts receivable – affiliates | (223,042) | (92,240) |  |
Investments in and advances to subsidiaries | (4,526,226) | (4,032,494) |  |
Other long-term assets | (201,109) | (149,317) |  |
Total assets | (4,950,377) | (4,274,051) |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable – affiliates | (223,042) | (92,240) |  |
Other long-term liabilities | (201,109) | (149,317) |  |
Other stockholders’ equity | (4,526,226) |  |  |
Total stockholders’ equity |  | (4,032,494) |  |
Total liabilities and stockholders’ equity | $ (4,950,377) | $ (4,274,051) |  |

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