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Consolidating Financial Statements - Schedule of Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 213,447 | $ 470,872 | $ 143,520 | $ 40,562
Short-term investments | 25,891 | 19,994 |  |
Accounts receivable - oil and gas revenues | 110,341 | 52,164 |  |
Accounts receivable - joint interest partners | 99,194 | 67,268 |  |
Accounts receivable - affiliates |  |  |  |
Inventory | 20,707 | 3,543 |  |
Prepaid expenses | 1,770 | 2,140 |  |
Advances to joint interest partners | 1,985 | 3,935 |  |
Derivative instruments | 19,016 |  |  |
Deferred income taxes |  | 3,233 |  |
Other current assets | 335 | 491 |  |
Total current assets | 492,686 | 623,640 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 2,348,128 | 1,235,357 |  |
Other property and equipment | 49,732 | 20,859 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (391,260) | (176,261) |  |
Total property, plant and equipment, net | 2,006,600 | 1,079,955 |  |
Derivative instruments | 4,981 | 4,362 |  |
Deferred costs and other assets | 24,527 | 19,425 |  |
Total assets | 2,528,794 | 1,727,382 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable | 12,491 | 12,207 |  |
Accounts payable - affiliates |  |  |  |
Advances from joint interest partners | 21,176 | 9,064 |  |
Revenues and production taxes payable | 71,553 | 19,468 |  |
Accrued liabilities | 189,863 | 119,692 |  |
Accrued interest payable | 30,096 | 15,774 |  |
Derivative instruments | 1,048 | 5,907 |  |
Deferred income taxes | 4,558 |  |  |
Other current liabilities |  | 472 |  |
Total current liabilities | 330,785 | 182,584 |  |
Long-term debt | 1,200,000 | 800,000 |  |
Asset retirement obligations | 22,956 | 13,075 |  |
Derivative instruments | 380 | 3,505 |  |
Deferred income taxes | 177,671 | 92,983 |  |
Other liabilities | 1,997 | 997 |  |
Total liabilities | 1,733,789 | 1,093,144 |  |
Stockholders' equity |  |  |  |
Common stock, $0.01 par value; 300,000,000 shares authorized; 92,483,393 issued and 92,460,914 outstanding | 925 | 921 |  |
Treasury stock, at cost; 129,414 and 22,479 shares at December 31, 2012 and 2011, respectively | (3,796) | (602) |  |
Additional paid-in-capital | 657,943 | 647,374 |  |
Retained earnings (deficit) | 139,933 | (13,455) |  |
Total stockholders' equity | 795,005 | 634,238 | 551,794 | 171,850
Total liabilities and stockholders' equity | 2,528,794 | 1,727,382 |  |
Parent/Issuer [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 133,797 | 443,482 | 119,940 |
Short-term investments | 25,891 | 19,994 |  |
Accounts receivable - affiliates | 310 | 88 |  |
Prepaid expenses | 313 | 309 |  |
Other current assets | 235 | 18 |  |
Total current assets | 160,546 | 463,891 |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | 1,807,010 | 958,880 |  |
Deferred income taxes | 42,746 | 13,158 |  |
Deferred costs and other assets | 20,748 | 15,742 |  |
Total assets | 2,031,050 | 1,451,671 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable | 9 | 23 |  |
Accounts payable - affiliates | 5,845 | 1,540 |  |
Accrued liabilities | 100 | 103 |  |
Accrued interest payable | 30,091 | 15,767 |  |
Total current liabilities | 36,045 | 17,433 |  |
Long-term debt | 1,200,000 | 800,000 |  |
Total liabilities | 1,236,045 | 817,433 |  |
Stockholders' equity |  |  |  |
Common stock, $0.01 par value; 300,000,000 shares authorized; 92,483,393 issued and 92,460,914 outstanding | 925 | 921 |  |
Treasury stock, at cost; 129,414 and 22,479 shares at December 31, 2012 and 2011, respectively | (3,796) | (602) |  |
Additional paid-in-capital | 657,943 | 647,374 |  |
Retained earnings (deficit) | 139,933 | (13,455) |  |
Total stockholders' equity | 795,005 | 634,238 |  |
Total liabilities and stockholders' equity | 2,031,050 | 1,451,671 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 79,650 | 27,390 | 23,580 | 40,562
Accounts receivable - oil and gas revenues | 110,341 | 52,164 |  |
Accounts receivable - joint interest partners | 99,194 | 67,268 |  |
Accounts receivable - affiliates | 5,845 | 1,540 |  |
Inventory | 20,707 | 3,543 |  |
Prepaid expenses | 1,457 | 1,831 |  |
Advances to joint interest partners | 1,985 | 3,935 |  |
Derivative instruments | 19,016 |  |  |
Deferred income taxes |  | 3,233 |  |
Other current assets | 100 | 473 |  |
Total current assets | 338,295 | 161,377 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 2,348,128 | 1,235,357 |  |
Other property and equipment | 49,732 | 20,859 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (391,260) | (176,261) |  |
Total property, plant and equipment, net | 2,006,600 | 1,079,955 |  |
Derivative instruments | 4,981 | 4,362 |  |
Deferred costs and other assets | 3,779 | 3,683 |  |
Total assets | 2,353,655 | 1,249,377 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable | 12,482 | 12,184 |  |
Accounts payable - affiliates | 310 | 88 |  |
Advances from joint interest partners | 21,176 | 9,064 |  |
Revenues and production taxes payable | 71,553 | 19,468 |  |
Accrued liabilities | 189,763 | 119,589 |  |
Accrued interest payable | 5 | 7 |  |
Derivative instruments | 1,048 | 5,907 |  |
Deferred income taxes | 4,558 |  |  |
Other current liabilities |  | 472 |  |
Total current liabilities | 300,895 | 166,779 |  |
Asset retirement obligations | 22,956 | 13,075 |  |
Derivative instruments | 380 | 3,505 |  |
Deferred income taxes | 220,417 | 106,141 |  |
Other liabilities | 1,997 | 997 |  |
Total liabilities | 546,645 | 290,497 |  |
Stockholders' equity |  |  |  |
Capital contributions from affiliates | 1,586,780 | 941,575 |  |
Additional paid-in-capital | 8,743 | 8,743 |  |
Retained earnings (deficit) | 211,487 | 8,562 |  |
Total stockholders' equity | 1,807,010 | 958,880 |  |
Total liabilities and stockholders' equity | 2,353,655 | 1,249,377 |  |
Intercompany Eliminations [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents |  |  |  |
Accounts receivable - affiliates | (6,155) | (1,628) |  |
Total current assets | (6,155) | (1,628) |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | (1,807,010) | (958,880) |  |
Deferred income taxes | (42,746) | (13,158) |  |
Total assets | (1,855,911) | (973,666) |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable - affiliates | (6,155) | (1,628) |  |
Total current liabilities | (6,155) | (1,628) |  |
Deferred income taxes | (42,746) | (13,158) |  |
Total liabilities | (48,901) | (14,786) |  |
Stockholders' equity |  |  |  |
Capital contributions from affiliates | (1,586,780) | (941,575) |  |
Additional paid-in-capital | (8,743) | (8,743) |  |
Retained earnings (deficit) | (211,487) | (8,562) |  |
Total stockholders' equity | (1,807,010) | (958,880) |  |
Total liabilities and stockholders' equity | $ (1,855,911) | $ (973,666) |  |

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