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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 165,989 | $ 213,447 | $ 287,298 | $ 470,872
Short-term investments | 25,891 | 25,891 |  |
Accounts receivable - oil and gas revenues | 132,069 | 110,341 |  |
Accounts receivable - joint interest partners | 80,826 | 99,194 |  |
Accounts receivable - from affiliates |  |  |  |
Inventory | 25,406 | 20,707 |  |
Prepaid expenses | 1,422 | 1,770 |  |
Advances to joint interest partners | 2,126 | 1,985 |  |
Derivative instruments | 5,647 | 19,016 |  |
Other current assets | 1,134 | 335 |  |
Total current assets | 440,510 | 492,686 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 2,487,198 | 2,348,128 |  |
Other property and equipment | 136,676 | 49,732 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (446,666) | (391,260) |  |
Total property, plant and equipment, net | 2,177,208 | 2,006,600 |  |
Derivative instruments | 5,284 | 4,981 |  |
Deferred costs and other assets | 23,716 | 24,527 |  |
Total assets | 2,646,718 | 2,528,794 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable | 23,560 | 12,491 |  |
Accounts payable - from affiliates |  |  |  |
Advances from joint interest partners | 19,485 | 21,176 |  |
Revenues and production taxes payable | 90,372 | 71,553 |  |
Accrued liabilities | 197,326 | 189,863 |  |
Accrued interest payable | 21,488 | 30,096 |  |
Derivative instruments | 4,660 | 1,048 |  |
Deferred income taxes |  | 4,558 |  |
Total current liabilities | 356,891 | 330,785 |  |
Long-term debt | 1,200,000 | 1,200,000 |  |
Asset retirement obligations | 25,029 | 22,956 |  |
Derivative instruments |  | 380 |  |
Deferred income taxes | 213,783 | 177,671 |  |
Other liabilities | 1,908 | 1,997 |  |
Total liabilities | 1,797,611 | 1,733,789 |  |
Stockholders' equity |  |  |  |
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,730,917 issued and 93,596,984 outstanding at March 31, 2013; 93,432,712 issued and 93,303,298 outstanding at December 31, 2012 | 925 | 925 |  |
Treasury stock, at cost; 133,933 and 129,414 shares at March 31, 2013 and December 31, 2012, respectively | (3,952) | (3,796) |  |
Additional paid-in-capital | 660,350 | 657,943 |  |
Retained earnings | 191,784 | 139,933 |  |
Total stockholders' equity | 849,107 | 795,005 |  |
Total liabilities and stockholders' equity | 2,646,718 | 2,528,794 |  |
Parent/Issuer [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 81,836 | 133,797 | 293,434 | 443,482
Short-term investments | 25,891 | 25,891 |  |
Accounts receivable - from affiliates | 299 | 310 |  |
Prepaid expenses | 156 | 313 |  |
Other current assets | 574 | 235 |  |
Total current assets | 108,756 | 160,546 |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | 1,896,635 | 1,807,010 |  |
Deferred income taxes | 51,372 | 42,746 |  |
Deferred costs and other assets | 20,103 | 20,748 |  |
Total assets | 2,076,866 | 2,031,050 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable | 2 | 9 |  |
Accounts payable - from affiliates | 6,222 | 5,845 |  |
Accrued liabilities | 63 | 100 |  |
Accrued interest payable | 21,472 | 30,091 |  |
Total current liabilities | 27,759 | 36,045 |  |
Long-term debt | 1,200,000 | 1,200,000 |  |
Total liabilities | 1,227,759 | 1,236,045 |  |
Stockholders' equity |  |  |  |
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,730,917 issued and 93,596,984 outstanding at March 31, 2013; 93,432,712 issued and 93,303,298 outstanding at December 31, 2012 | 925 | 925 |  |
Treasury stock, at cost; 133,933 and 129,414 shares at March 31, 2013 and December 31, 2012, respectively | (3,952) | (3,796) |  |
Additional paid-in-capital | 660,350 | 657,943 |  |
Retained earnings | 191,784 | 139,933 |  |
Total stockholders' equity | 849,107 | 795,005 |  |
Total liabilities and stockholders' equity | 2,076,866 | 2,031,050 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 84,153 | 79,650 | (6,136) | 27,390
Accounts receivable - oil and gas revenues | 132,069 | 110,341 |  |
Accounts receivable - joint interest partners | 80,826 | 99,194 |  |
Accounts receivable - from affiliates | 6,222 | 5,845 |  |
Inventory | 25,406 | 20,707 |  |
Prepaid expenses | 1,266 | 1,457 |  |
Advances to joint interest partners | 2,126 | 1,985 |  |
Derivative instruments | 5,647 | 19,016 |  |
Other current assets | 560 | 100 |  |
Total current assets | 338,275 | 338,295 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 2,487,198 | 2,348,128 |  |
Other property and equipment | 136,676 | 49,732 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (446,666) | (391,260) |  |
Total property, plant and equipment, net | 2,177,208 | 2,006,600 |  |
Derivative instruments | 5,284 | 4,981 |  |
Deferred costs and other assets | 3,613 | 3,779 |  |
Total assets | 2,524,380 | 2,353,655 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable | 23,558 | 12,482 |  |
Accounts payable - from affiliates | 299 | 310 |  |
Advances from joint interest partners | 19,485 | 21,176 |  |
Revenues and production taxes payable | 90,372 | 71,553 |  |
Accrued liabilities | 197,263 | 189,763 |  |
Accrued interest payable | 16 | 5 |  |
Derivative instruments | 4,660 | 1,048 |  |
Deferred income taxes |  | 4,558 |  |
Total current liabilities | 335,653 | 300,895 |  |
Asset retirement obligations | 25,029 | 22,956 |  |
Derivative instruments |  | 380 |  |
Deferred income taxes | 265,155 | 220,417 |  |
Other liabilities | 1,908 | 1,997 |  |
Total liabilities | 627,745 | 546,645 |  |
Stockholders' equity |  |  |  |
Capital contributions from affiliates | 1,610,162 | 1,586,780 |  |
Additional paid-in-capital | 8,743 | 8,743 |  |
Retained earnings | 277,730 | 211,487 |  |
Total stockholders' equity | 1,896,635 | 1,807,010 |  |
Total liabilities and stockholders' equity | 2,524,380 | 2,353,655 |  |
Intercompany Eliminations [Member] |  |  |  |
ASSETS |  |  |  |
Accounts receivable - from affiliates | (6,521) | (6,155) |  |
Total current assets | (6,521) | (6,155) |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | (1,896,635) | (1,807,010) |  |
Deferred income taxes | (51,372) | (42,746) |  |
Total assets | (1,954,528) | (1,855,911) |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Accounts payable - from affiliates | (6,521) | (6,155) |  |
Total current liabilities | (6,521) | (6,155) |  |
Deferred income taxes | (51,372) | (42,746) |  |
Total liabilities | (57,893) | (48,901) |  |
Stockholders' equity |  |  |  |
Capital contributions from affiliates | (1,610,162) | (1,586,780) |  |
Additional paid-in-capital | (8,743) | (8,743) |  |
Retained earnings | (277,730) | (211,487) |  |
Total stockholders' equity | (1,896,635) | (1,807,010) |  |
Total liabilities and stockholders' equity | $ (1,954,528) | $ (1,855,911) |  |

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