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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 56,298 | $ 91,901 | $ 165,989 | $ 213,447
Accounts receivable — oil and gas revenues | 202,749 | 175,653 |  |
Accounts receivable — joint interest partners | 134,553 | 139,459 |  |
Accounts receivable – affiliates |  |  |  |
Inventory | 19,862 | 20,652 |  |
Prepaid expenses | 24,450 | 10,191 |  |
Deferred income taxes | 8,484 | 6,335 |  |
Derivative instruments | 778 | 2,264 |  |
Advances to joint interest partners | 214 | 760 |  |
Other current assets | 420 | 391 |  |
Total current assets | 447,808 | 447,606 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 4,820,902 | 4,528,958 |  |
Other property and equipment | 200,158 | 188,468 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (723,429) | (637,676) |  |
Total property, plant and equipment, net | 4,297,631 | 4,079,750 |  |
Assets held for sale | 0 | 137,066 |  |
Derivative instruments | 470 | 1,333 |  |
Deferred income taxes |  |  |  |
Deferred costs and other assets | 46,175 | 46,169 |  |
Total assets | 4,792,084 | 4,711,924 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 24,516 | 8,920 |  |
Accounts payable – affiliates |  |  |  |
Revenues and production taxes payable | 183,120 | 146,741 |  |
Accrued liabilities | 283,024 | 241,830 |  |
Accrued interest payable | 24,562 | 47,910 |  |
Derivative instruments | 20,663 | 8,188 |  |
Advances from joint interest partners | 10,931 | 12,829 |  |
Other current liabilities | 2,766 | 0 |  |
Total current liabilities | 549,582 | 466,418 |  |
Long-term debt | 2,260,000 | 2,535,570 |  |
Deferred income taxes | 424,049 | 323,147 |  |
Asset retirement obligations | 35,790 | 35,918 |  |
Derivative instruments | 679 | 139 |  |
Other liabilities | 2,002 | 2,183 |  |
Total liabilities | 3,272,102 | 3,363,375 |  |
Stockholders’ equity |  |  |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,416,749 and 100,866,589 shares issued at March 31, 2014 and December 31, 2013, respectively | 999 | 996 |  |
Treasury stock, at cost: 238,453 and 167,155 shares at March 31, 2014 and December 31, 2013, respectively | (8,387) | (5,362) |  |
Additional paid-in capital | 989,525 | 985,023 |  |
Retained earnings | 537,845 | 367,892 |  |
Total stockholders’ equity | 1,519,982 | 1,348,549 |  |
Total liabilities and stockholders’ equity | 4,792,084 | 4,711,924 |  |
Parent/Issuer [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 936 | 34,277 | 81,836 | 133,797
Accounts receivable – affiliates | 770 | 770 |  |
Prepaid expenses | 159 | 318 |  |
Other current assets | 0 |  |  |
Total current assets | 1,865 | 35,365 |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | 3,621,362 | 3,450,668 |  |
Deferred income taxes | 101,341 | 85,288 |  |
Deferred costs and other assets | 32,862 | 33,983 |  |
Total assets | 3,757,430 | 3,605,304 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 0 | 0 |  |
Accounts payable – affiliates | 12,802 | 9,100 |  |
Accrued liabilities | 119 | 33 |  |
Accrued interest payable | 24,527 | 47,622 |  |
Total current liabilities | 37,448 | 56,755 |  |
Long-term debt | 2,200,000 | 2,200,000 |  |
Total liabilities | 2,237,448 | 2,256,755 |  |
Stockholders’ equity |  |  |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,416,749 and 100,866,589 shares issued at March 31, 2014 and December 31, 2013, respectively | 999 | 996 |  |
Treasury stock, at cost: 238,453 and 167,155 shares at March 31, 2014 and December 31, 2013, respectively | (8,387) | (5,362) |  |
Additional paid-in capital | 989,525 | 985,023 |  |
Retained earnings | 537,845 | 367,892 |  |
Total stockholders’ equity | 1,519,982 | 1,348,549 |  |
Total liabilities and stockholders’ equity | 3,757,430 | 3,605,304 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 55,362 | 57,624 | 84,153 | 79,650
Accounts receivable — oil and gas revenues | 202,749 | 175,653 |  |
Accounts receivable — joint interest partners | 134,553 | 139,459 |  |
Accounts receivable – affiliates | 12,802 | 9,100 |  |
Inventory | 19,862 | 20,652 |  |
Prepaid expenses | 24,291 | 9,873 |  |
Deferred income taxes | 8,484 | 6,335 |  |
Derivative instruments | 778 | 2,264 |  |
Advances to joint interest partners | 214 | 760 |  |
Other current assets | 420 | 391 |  |
Total current assets | 459,515 | 422,111 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 4,820,902 | 4,528,958 |  |
Other property and equipment | 200,158 | 188,468 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (723,429) | (637,676) |  |
Total property, plant and equipment, net | 4,297,631 | 4,079,750 |  |
Assets held for sale |  | 137,066 |  |
Derivative instruments | 470 | 1,333 |  |
Deferred costs and other assets | 13,313 | 12,186 |  |
Total assets | 4,770,929 | 4,652,446 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 24,516 | 8,920 |  |
Accounts payable – affiliates | 770 | 770 |  |
Revenues and production taxes payable | 183,120 | 146,741 |  |
Accrued liabilities | 282,905 | 241,797 |  |
Accrued interest payable | 35 | 288 |  |
Derivative instruments | 20,663 | 8,188 |  |
Advances from joint interest partners | 10,931 | 12,829 |  |
Other current liabilities | 2,766 |  |  |
Total current liabilities | 525,706 | 419,533 |  |
Long-term debt | 60,000 | 335,570 |  |
Deferred income taxes | 525,390 | 408,435 |  |
Asset retirement obligations | 35,790 | 35,918 |  |
Derivative instruments | 679 | 139 |  |
Other liabilities | 2,002 | 2,183 |  |
Total liabilities | 1,149,567 | 1,201,778 |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | 2,904,739 | 2,930,978 |  |
Additional paid-in capital | 8,743 | 8,743 |  |
Retained earnings | 707,880 | 510,947 |  |
Total stockholders’ equity | 3,621,362 | 3,450,668 |  |
Total liabilities and stockholders’ equity | 4,770,929 | 4,652,446 |  |
Intercompany Eliminations [Member] |  |  |  |
ASSETS |  |  |  |
Accounts receivable – affiliates | (13,572) | (9,870) |  |
Total current assets | (13,572) | (9,870) |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | (3,621,362) | (3,450,668) |  |
Deferred income taxes | (101,341) | (85,288) |  |
Total assets | (3,736,275) | (3,545,826) |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable – affiliates | (13,572) | (9,870) |  |
Total current liabilities | (13,572) | (9,870) |  |
Deferred income taxes | (101,341) | (85,288) |  |
Total liabilities | (114,913) | (95,158) |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | (2,904,739) | (2,930,978) |  |
Additional paid-in capital | (8,743) | (8,743) |  |
Retained earnings | (707,880) | (510,947) |  |
Total stockholders’ equity | (3,621,362) | (3,450,668) |  |
Total liabilities and stockholders’ equity | $ (3,736,275) | $ (3,545,826) |  |

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