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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
ASSETS        
Cash and cash equivalents $ 67,194 $ 91,901 $ 125,440 $ 213,447
Accounts receivable — oil and gas revenues 191,711 175,653    
Accounts receivable — joint interest partners 197,929 139,459    
Accounts receivable – affiliates         
Inventory 24,648 20,652    
Prepaid expenses 14,253 10,191    
Deferred income taxes   6,335    
Derivative instruments 33,874 2,264    
Advances to joint interest partners 97 760    
Other current assets 1,972 391    
Total current assets 531,678 447,606    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 5,546,424 4,528,958    
Other property and equipment 261,665 188,468    
Less: accumulated depreciation, depletion, amortization and impairment (933,237) (637,676)    
Total property, plant and equipment, net 4,874,852 4,079,750    
Assets held for sale 0 137,066    
Derivative instruments 6,422 1,333    
Deferred income taxes         
Deferred costs and other assets 44,523 46,169    
Total assets 5,457,475 4,711,924    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 39,550 8,920    
Accounts payable – affiliates         
Revenues and production taxes payable 248,272 146,741    
Accrued liabilities 340,480 241,830    
Accrued interest payable 24,902 47,910    
Derivative instruments 0 8,188    
Deferred income taxes 9,625 0    
Advances from joint interest partners 6,776 12,829    
Total current liabilities 669,605 466,418    
Long-term debt 2,550,000 2,535,570    
Deferred income taxes 504,735 323,147    
Asset retirement obligations 41,052 35,918    
Derivative instruments 0 139    
Other liabilities 1,996 2,183    
Total liabilities 3,767,388 3,363,375    
Stockholders’ equity        
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,614,588 and 100,866,589 shares issued at September 30, 2014 and December 31, 2013, respectively 1,000 996    
Treasury stock, at cost: 283,249 and 167,155 shares at September 30, 2014 and December 31, 2013, respectively (10,602) (5,362)    
Additional paid-in capital 1,001,424 985,023    
Retained earnings 698,265 367,892    
Total stockholders’ equity 1,690,087 1,348,549    
Total liabilities and stockholders’ equity 5,457,475 4,711,924    
Parent/Issuer [Member]
        
ASSETS        
Cash and cash equivalents 777 34,277 32,955 133,797
Accounts receivable – affiliates 781 770    
Prepaid expenses 445 318    
Total current assets 2,003 35,365    
Property, plant and equipment        
Investments in and advances to subsidiaries 3,826,612 3,450,668    
Deferred income taxes 133,526 85,288    
Deferred costs and other assets 30,582 33,983    
Total assets 3,992,723 3,605,304    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable – affiliates 78,053 9,100    
Accrued liabilities 55 33    
Accrued interest payable 24,528 47,622    
Total current liabilities 102,636 56,755    
Long-term debt 2,200,000 2,200,000    
Total liabilities 2,302,636 2,256,755    
Stockholders’ equity        
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,614,588 and 100,866,589 shares issued at September 30, 2014 and December 31, 2013, respectively 1,000 996    
Treasury stock, at cost: 283,249 and 167,155 shares at September 30, 2014 and December 31, 2013, respectively (10,602) (5,362)    
Additional paid-in capital 1,001,424 985,023    
Retained earnings 698,265 367,892    
Total stockholders’ equity 1,690,087 1,348,549    
Total liabilities and stockholders’ equity 3,992,723 3,605,304    
Combined Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 66,417 57,624 92,485 79,650
Accounts receivable — oil and gas revenues 191,711 175,653    
Accounts receivable — joint interest partners 197,929 139,459    
Accounts receivable – affiliates 78,053 9,100    
Inventory 24,648 20,652    
Prepaid expenses 13,808 9,873    
Deferred income taxes   6,335    
Derivative instruments 33,874 2,264    
Advances to joint interest partners 97 760    
Other current assets 1,972 391    
Total current assets 608,509 422,111    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 5,546,424 4,528,958    
Other property and equipment 261,665 188,468    
Less: accumulated depreciation, depletion, amortization and impairment (933,237) (637,676)    
Total property, plant and equipment, net 4,874,852 4,079,750    
Assets held for sale   137,066    
Derivative instruments 6,422 1,333    
Deferred costs and other assets 13,941 12,186    
Total assets 5,503,724 4,652,446    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 39,550 8,920    
Accounts payable – affiliates 781 770    
Revenues and production taxes payable 248,272 146,741    
Accrued liabilities 340,425 241,797    
Accrued interest payable 374 288    
Derivative instruments   8,188    
Deferred income taxes 9,625      
Advances from joint interest partners 6,776 12,829    
Total current liabilities 645,803 419,533    
Long-term debt 350,000 335,570    
Deferred income taxes 638,261 408,435    
Asset retirement obligations 41,052 35,918    
Derivative instruments   139    
Other liabilities 1,996 2,183    
Total liabilities 1,677,112 1,201,778    
Stockholders’ equity        
Capital contributions from affiliates 2,896,147 2,930,978    
Additional paid-in capital 8,743 8,743    
Retained earnings 921,722 510,947    
Total stockholders’ equity 3,826,612 3,450,668    
Total liabilities and stockholders’ equity 5,503,724 4,652,446    
Intercompany Eliminations [Member]
        
ASSETS        
Accounts receivable – affiliates (78,834) (9,870)    
Total current assets (78,834) (9,870)    
Property, plant and equipment        
Investments in and advances to subsidiaries (3,826,612) (3,450,668)    
Deferred income taxes (133,526) (85,288)    
Total assets (4,038,972) (3,545,826)    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable – affiliates (78,834) (9,870)    
Total current liabilities (78,834) (9,870)    
Deferred income taxes (133,526) (85,288)    
Total liabilities (212,360) (95,158)    
Stockholders’ equity        
Capital contributions from affiliates (2,896,147) (2,930,978)    
Additional paid-in capital (8,743) (8,743)    
Retained earnings (921,722) (510,947)    
Total stockholders’ equity (3,826,612) (3,450,668)    
Total liabilities and stockholders’ equity $ (4,038,972) $ (3,545,826)