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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
ASSETS        
Cash and cash equivalents $ 26,957 $ 91,901 $ 161,601 $ 213,447
Accounts receivable — oil and gas revenues 216,764 175,653    
Accounts receivable — joint interest partners 147,056 139,459    
Accounts receivable – affiliates         
Inventory 17,636 20,652    
Prepaid expenses 8,907 10,191    
Deferred income taxes 25,390 6,335    
Derivative instruments 0 2,264    
Advances to joint interest partners 97 760    
Other current assets 421 391    
Total current assets 443,228 447,606    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 5,141,582 4,528,958    
Other property and equipment 231,129 188,468    
Less: accumulated depreciation, depletion, amortization and impairment (823,500) (637,676)    
Total property, plant and equipment, net 4,549,211 4,079,750    
Assets held for sale 0 137,066    
Derivative instruments 0 1,333    
Deferred income taxes         
Deferred costs and other assets 44,540 46,169    
Total assets 5,036,979 4,711,924    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 32,402 8,920    
Accounts payable – affiliates         
Revenues and production taxes payable 217,414 146,741    
Accrued liabilities 288,813 241,830    
Accrued interest payable 49,444 47,910    
Derivative instruments 62,415 8,188    
Advances from joint interest partners 6,910 12,829    
Other current liabilities 3,311 0    
Total current liabilities 660,709 466,418    
Long-term debt 2,300,000 2,535,570    
Deferred income taxes 460,897 323,147    
Asset retirement obligations 37,542 35,918    
Derivative instruments 11,844 139    
Other liabilities 1,963 2,183    
Total liabilities 3,472,955 3,363,375    
Stockholders’ equity        
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,396,597 and 100,866,589 shares issued at June 30, 2014 and December 31, 2013, respectively 999 996    
Treasury stock, at cost: 244,729 and 167,155 shares at June 30, 2014 and December 31, 2013, respectively (8,677) (5,362)    
Additional paid-in capital 995,024 985,023    
Retained earnings 576,678 367,892    
Total stockholders’ equity 1,564,024 1,348,549    
Total liabilities and stockholders’ equity 5,036,979 4,711,924    
Parent/Issuer [Member]
        
ASSETS        
Cash and cash equivalents 1,603 34,277 83,770 133,797
Accounts receivable – affiliates 781 770    
Prepaid expenses   318    
Total current assets 2,384 35,365    
Property, plant and equipment        
Investments in and advances to subsidiaries 3,675,495 3,450,668    
Deferred income taxes 117,199 85,288    
Deferred costs and other assets 31,726 33,983    
Total assets 3,826,804 3,605,304    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable – affiliates 13,416 9,100    
Accrued liabilities 24 33    
Accrued interest payable 49,340 47,622    
Total current liabilities 62,780 56,755    
Long-term debt 2,200,000 2,200,000    
Total liabilities 2,262,780 2,256,755    
Stockholders’ equity        
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,396,597 and 100,866,589 shares issued at June 30, 2014 and December 31, 2013, respectively 999 996    
Treasury stock, at cost: 244,729 and 167,155 shares at June 30, 2014 and December 31, 2013, respectively (8,677) (5,362)    
Additional paid-in capital 995,024 985,023    
Retained earnings 576,678 367,892    
Total stockholders’ equity 1,564,024 1,348,549    
Total liabilities and stockholders’ equity 3,826,804 3,605,304    
Combined Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 25,354 57,624 77,831 79,650
Accounts receivable — oil and gas revenues 216,764 175,653    
Accounts receivable — joint interest partners 147,056 139,459    
Accounts receivable – affiliates 13,416 9,100    
Inventory 17,636 20,652    
Prepaid expenses 8,907 9,873    
Deferred income taxes 25,390 6,335    
Derivative instruments   2,264    
Advances to joint interest partners 97 760    
Other current assets 421 391    
Total current assets 455,041 422,111    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 5,141,582 4,528,958    
Other property and equipment 231,129 188,468    
Less: accumulated depreciation, depletion, amortization and impairment (823,500) (637,676)    
Total property, plant and equipment, net 4,549,211 4,079,750    
Assets held for sale   137,066    
Derivative instruments   1,333    
Deferred costs and other assets 12,814 12,186    
Total assets 5,017,066 4,652,446    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 32,402 8,920    
Accounts payable – affiliates 781 770    
Revenues and production taxes payable 217,414 146,741    
Accrued liabilities 288,789 241,797    
Accrued interest payable 104 288    
Derivative instruments 62,415 8,188    
Advances from joint interest partners 6,910 12,829    
Other current liabilities 3,311      
Total current liabilities 612,126 419,533    
Long-term debt 100,000 335,570    
Deferred income taxes 578,096 408,435    
Asset retirement obligations 37,542 35,918    
Derivative instruments 11,844 139    
Other liabilities 1,963 2,183    
Total liabilities 1,341,571 1,201,778    
Stockholders’ equity        
Capital contributions from affiliates 2,893,387 2,930,978    
Additional paid-in capital 8,743 8,743    
Retained earnings 773,365 510,947    
Total stockholders’ equity 3,675,495 3,450,668    
Total liabilities and stockholders’ equity 5,017,066 4,652,446    
Intercompany Eliminations [Member]
        
ASSETS        
Accounts receivable – affiliates (14,197) (9,870)    
Total current assets (14,197) (9,870)    
Property, plant and equipment        
Investments in and advances to subsidiaries (3,675,495) (3,450,668)    
Deferred income taxes (117,199) (85,288)    
Total assets (3,806,891) (3,545,826)    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable – affiliates (14,197) (9,870)    
Total current liabilities (14,197) (9,870)    
Deferred income taxes (117,199) (85,288)    
Total liabilities (131,396) (95,158)    
Stockholders’ equity        
Capital contributions from affiliates (2,893,387) (2,930,978)    
Additional paid-in capital (8,743) (8,743)    
Retained earnings (773,365) (510,947)    
Total stockholders’ equity (3,675,495) (3,450,668)    
Total liabilities and stockholders’ equity $ (3,806,891) $ (3,545,826)