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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
ASSETS        
Cash and cash equivalents $ 161,601 $ 213,447 $ 238,886 $ 470,872
Short-term investments 0 25,891    
Accounts receivable — oil and gas revenues 130,518 110,341    
Accounts receivable — joint interest partners 92,785 99,194    
Accounts receivable – from affiliates         
Inventory 16,385 20,707    
Prepaid expenses 6,121 1,770    
Advances to joint interest partners 1,319 1,985    
Derivative instruments 7,353 19,016    
Other current assets 5 335    
Total current assets 416,087 492,686    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 2,675,902 2,348,128    
Other property and equipment 144,518 49,732    
Less: accumulated depreciation, depletion, amortization and impairment (514,567) (391,260)    
Total property, plant and equipment, net 2,305,853 2,006,600    
Derivative instruments 10,554 4,981    
Deferred income taxes         
Deferred costs and other assets 25,650 24,527    
Total assets 2,758,144 2,528,794    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 30,682 12,491    
Accounts payable – from affiliates         
Advances from joint interest partners 15,583 21,176    
Revenues and production taxes payable 102,661 71,553    
Accrued liabilities 180,988 189,863    
Accrued interest payable 29,133 30,096    
Derivative instruments 0 1,048    
Deferred income taxes 1,030 4,558    
Other current liabilities 688 0    
Total current liabilities 360,765 330,785    
Long-term debt 1,200,000 1,200,000    
Asset retirement obligations 26,268 22,956    
Derivative instruments 291 380    
Deferred income taxes 249,172 177,671    
Other liabilities 2,435 1,997    
Total liabilities 1,838,931 1,733,789    
Stockholders’ equity        
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,693,829 issued and 93,554,121 outstanding at June 30, 2013; 93,432,712 issued and 93,303,298 outstanding at December 31, 2012 925 925    
Treasury stock, at cost; 139,708 and 129,414 shares at June 30, 2013 and December 31, 2012, respectively (4,160) (3,796)    
Additional paid-in-capital 663,545 657,943    
Retained earnings 258,903 139,933    
Total stockholders’ equity 919,213 795,005    
Total liabilities and stockholders’ equity 2,758,144 2,528,794    
Parent/Issuer [Member]
        
ASSETS        
Cash and cash equivalents 83,770 133,797 195,660 443,482
Short-term investments   25,891    
Accounts receivable – from affiliates 771 310    
Prepaid expenses 0 313    
Other current assets 3 235    
Total current assets 84,544 160,546    
Property, plant and equipment        
Investments in and advances to subsidiaries 1,990,470 1,807,010    
Deferred income taxes 60,406 42,746    
Deferred costs and other assets 19,450 20,748    
Total assets 2,154,870 2,031,050    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 22 9    
Accounts payable – from affiliates 6,511 5,845    
Accrued liabilities 27 100    
Accrued interest payable 29,097 30,091    
Total current liabilities 35,657 36,045    
Long-term debt 1,200,000 1,200,000    
Total liabilities 1,235,657 1,236,045    
Stockholders’ equity        
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,693,829 issued and 93,554,121 outstanding at June 30, 2013; 93,432,712 issued and 93,303,298 outstanding at December 31, 2012 925 925    
Treasury stock, at cost; 139,708 and 129,414 shares at June 30, 2013 and December 31, 2012, respectively (4,160) (3,796)    
Additional paid-in-capital 663,545 657,943    
Retained earnings 258,903 139,933    
Total stockholders’ equity 919,213 795,005    
Total liabilities and stockholders’ equity 2,154,870 2,031,050    
Combined Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 77,831 79,650 43,226 27,390
Accounts receivable — oil and gas revenues 130,518 110,341    
Accounts receivable — joint interest partners 92,785 99,194    
Accounts receivable – from affiliates 6,511 5,845    
Inventory 16,385 20,707    
Prepaid expenses 6,121 1,457    
Advances to joint interest partners 1,319 1,985    
Derivative instruments 7,353 19,016    
Other current assets 2 100    
Total current assets 338,825 338,295    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 2,675,902 2,348,128    
Other property and equipment 144,518 49,732    
Less: accumulated depreciation, depletion, amortization and impairment (514,567) (391,260)    
Total property, plant and equipment, net 2,305,853 2,006,600    
Derivative instruments 10,554 4,981    
Deferred costs and other assets 6,200 3,779    
Total assets 2,661,432 2,353,655    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 30,660 12,482    
Accounts payable – from affiliates 771 310    
Advances from joint interest partners 15,583 21,176    
Revenues and production taxes payable 102,661 71,553    
Accrued liabilities 180,961 189,763    
Accrued interest payable 36 5    
Derivative instruments   1,048    
Deferred income taxes 1,030 4,558    
Other current liabilities 688      
Total current liabilities 332,390 300,895    
Asset retirement obligations 26,268 22,956    
Derivative instruments 291 380    
Deferred income taxes 309,578 220,417    
Other liabilities 2,435 1,997    
Total liabilities 670,962 546,645    
Stockholders’ equity        
Capital contributions from affiliates 1,621,489 1,586,780    
Additional paid-in-capital 8,743 8,743    
Retained earnings 360,238 211,487    
Total stockholders’ equity 1,990,470 1,807,010    
Total liabilities and stockholders’ equity 2,661,432 2,353,655    
Intercompany Eliminations [Member]
        
ASSETS        
Accounts receivable – from affiliates (7,282) (6,155)    
Total current assets (7,282) (6,155)    
Property, plant and equipment        
Investments in and advances to subsidiaries (1,990,470) (1,807,010)    
Deferred income taxes (60,406) (42,746)    
Total assets (2,058,158) (1,855,911)    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable – from affiliates (7,282) (6,155)    
Total current liabilities (7,282) (6,155)    
Deferred income taxes (60,406) (42,746)    
Total liabilities (67,688) (48,901)    
Stockholders’ equity        
Capital contributions from affiliates (1,621,489) (1,586,780)    
Additional paid-in-capital (8,743) (8,743)    
Retained earnings (360,238) (211,487)    
Total stockholders’ equity (1,990,470) (1,807,010)    
Total liabilities and stockholders’ equity $ (2,058,158) $ (1,855,911)