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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)