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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 26,957 | $ 91,901 | $ 161,601 | $ 213,447
Accounts receivable — oil and gas revenues | 216,764 | 175,653 |  |
Accounts receivable — joint interest partners | 147,056 | 139,459 |  |
Accounts receivable – affiliates |  |  |  |
Inventory | 17,636 | 20,652 |  |
Prepaid expenses | 8,907 | 10,191 |  |
Deferred income taxes | 25,390 | 6,335 |  |
Derivative instruments | 0 | 2,264 |  |
Advances to joint interest partners | 97 | 760 |  |
Other current assets | 421 | 391 |  |
Total current assets | 443,228 | 447,606 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 5,141,582 | 4,528,958 |  |
Other property and equipment | 231,129 | 188,468 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (823,500) | (637,676) |  |
Total property, plant and equipment, net | 4,549,211 | 4,079,750 |  |
Assets held for sale | 0 | 137,066 |  |
Derivative instruments | 0 | 1,333 |  |
Deferred income taxes |  |  |  |
Deferred costs and other assets | 44,540 | 46,169 |  |
Total assets | 5,036,979 | 4,711,924 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 32,402 | 8,920 |  |
Accounts payable – affiliates |  |  |  |
Revenues and production taxes payable | 217,414 | 146,741 |  |
Accrued liabilities | 288,813 | 241,830 |  |
Accrued interest payable | 49,444 | 47,910 |  |
Derivative instruments | 62,415 | 8,188 |  |
Advances from joint interest partners | 6,910 | 12,829 |  |
Other current liabilities | 3,311 | 0 |  |
Total current liabilities | 660,709 | 466,418 |  |
Long-term debt | 2,300,000 | 2,535,570 |  |
Deferred income taxes | 460,897 | 323,147 |  |
Asset retirement obligations | 37,542 | 35,918 |  |
Derivative instruments | 11,844 | 139 |  |
Other liabilities | 1,963 | 2,183 |  |
Total liabilities | 3,472,955 | 3,363,375 |  |
Stockholders’ equity |  |  |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,396,597 and 100,866,589 shares issued at June 30, 2014 and December 31, 2013, respectively | 999 | 996 |  |
Treasury stock, at cost: 244,729 and 167,155 shares at June 30, 2014 and December 31, 2013, respectively | (8,677) | (5,362) |  |
Additional paid-in capital | 995,024 | 985,023 |  |
Retained earnings | 576,678 | 367,892 |  |
Total stockholders’ equity | 1,564,024 | 1,348,549 |  |
Total liabilities and stockholders’ equity | 5,036,979 | 4,711,924 |  |
Parent/Issuer [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 1,603 | 34,277 | 83,770 | 133,797
Accounts receivable – affiliates | 781 | 770 |  |
Prepaid expenses |  | 318 |  |
Total current assets | 2,384 | 35,365 |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | 3,675,495 | 3,450,668 |  |
Deferred income taxes | 117,199 | 85,288 |  |
Deferred costs and other assets | 31,726 | 33,983 |  |
Total assets | 3,826,804 | 3,605,304 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable – affiliates | 13,416 | 9,100 |  |
Accrued liabilities | 24 | 33 |  |
Accrued interest payable | 49,340 | 47,622 |  |
Total current liabilities | 62,780 | 56,755 |  |
Long-term debt | 2,200,000 | 2,200,000 |  |
Total liabilities | 2,262,780 | 2,256,755 |  |
Stockholders’ equity |  |  |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,396,597 and 100,866,589 shares issued at June 30, 2014 and December 31, 2013, respectively | 999 | 996 |  |
Treasury stock, at cost: 244,729 and 167,155 shares at June 30, 2014 and December 31, 2013, respectively | (8,677) | (5,362) |  |
Additional paid-in capital | 995,024 | 985,023 |  |
Retained earnings | 576,678 | 367,892 |  |
Total stockholders’ equity | 1,564,024 | 1,348,549 |  |
Total liabilities and stockholders’ equity | 3,826,804 | 3,605,304 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 25,354 | 57,624 | 77,831 | 79,650
Accounts receivable — oil and gas revenues | 216,764 | 175,653 |  |
Accounts receivable — joint interest partners | 147,056 | 139,459 |  |
Accounts receivable – affiliates | 13,416 | 9,100 |  |
Inventory | 17,636 | 20,652 |  |
Prepaid expenses | 8,907 | 9,873 |  |
Deferred income taxes | 25,390 | 6,335 |  |
Derivative instruments |  | 2,264 |  |
Advances to joint interest partners | 97 | 760 |  |
Other current assets | 421 | 391 |  |
Total current assets | 455,041 | 422,111 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 5,141,582 | 4,528,958 |  |
Other property and equipment | 231,129 | 188,468 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (823,500) | (637,676) |  |
Total property, plant and equipment, net | 4,549,211 | 4,079,750 |  |
Assets held for sale |  | 137,066 |  |
Derivative instruments |  | 1,333 |  |
Deferred costs and other assets | 12,814 | 12,186 |  |
Total assets | 5,017,066 | 4,652,446 |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 32,402 | 8,920 |  |
Accounts payable – affiliates | 781 | 770 |  |
Revenues and production taxes payable | 217,414 | 146,741 |  |
Accrued liabilities | 288,789 | 241,797 |  |
Accrued interest payable | 104 | 288 |  |
Derivative instruments | 62,415 | 8,188 |  |
Advances from joint interest partners | 6,910 | 12,829 |  |
Other current liabilities | 3,311 |  |  |
Total current liabilities | 612,126 | 419,533 |  |
Long-term debt | 100,000 | 335,570 |  |
Deferred income taxes | 578,096 | 408,435 |  |
Asset retirement obligations | 37,542 | 35,918 |  |
Derivative instruments | 11,844 | 139 |  |
Other liabilities | 1,963 | 2,183 |  |
Total liabilities | 1,341,571 | 1,201,778 |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | 2,893,387 | 2,930,978 |  |
Additional paid-in capital | 8,743 | 8,743 |  |
Retained earnings | 773,365 | 510,947 |  |
Total stockholders’ equity | 3,675,495 | 3,450,668 |  |
Total liabilities and stockholders’ equity | 5,017,066 | 4,652,446 |  |
Intercompany Eliminations [Member] |  |  |  |
ASSETS |  |  |  |
Accounts receivable – affiliates | (14,197) | (9,870) |  |
Total current assets | (14,197) | (9,870) |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | (3,675,495) | (3,450,668) |  |
Deferred income taxes | (117,199) | (85,288) |  |
Total assets | (3,806,891) | (3,545,826) |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable – affiliates | (14,197) | (9,870) |  |
Total current liabilities | (14,197) | (9,870) |  |
Deferred income taxes | (117,199) | (85,288) |  |
Total liabilities | (131,396) | (95,158) |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | (2,893,387) | (2,930,978) |  |
Additional paid-in capital | (8,743) | (8,743) |  |
Retained earnings | (773,365) | (510,947) |  |
Total stockholders’ equity | (3,675,495) | (3,450,668) |  |
Total liabilities and stockholders’ equity | $ (3,806,891) | $ (3,545,826) |  |

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