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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
ASSETS        
Cash and cash equivalents $ 56,298 $ 91,901 $ 165,989 $ 213,447
Accounts receivable — oil and gas revenues 202,749 175,653    
Accounts receivable — joint interest partners 134,553 139,459    
Accounts receivable – affiliates         
Inventory 19,862 20,652    
Prepaid expenses 24,450 10,191    
Deferred income taxes 8,484 6,335    
Derivative instruments 778 2,264    
Advances to joint interest partners 214 760    
Other current assets 420 391    
Total current assets 447,808 447,606    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 4,820,902 4,528,958    
Other property and equipment 200,158 188,468    
Less: accumulated depreciation, depletion, amortization and impairment (723,429) (637,676)    
Total property, plant and equipment, net 4,297,631 4,079,750    
Assets held for sale 0 137,066    
Derivative instruments 470 1,333    
Deferred income taxes         
Deferred costs and other assets 46,175 46,169    
Total assets 4,792,084 4,711,924    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 24,516 8,920    
Accounts payable – affiliates         
Revenues and production taxes payable 183,120 146,741    
Accrued liabilities 283,024 241,830    
Accrued interest payable 24,562 47,910    
Derivative instruments 20,663 8,188    
Advances from joint interest partners 10,931 12,829    
Other current liabilities 2,766 0    
Total current liabilities 549,582 466,418    
Long-term debt 2,260,000 2,535,570    
Deferred income taxes 424,049 323,147    
Asset retirement obligations 35,790 35,918    
Derivative instruments 679 139    
Other liabilities 2,002 2,183    
Total liabilities 3,272,102 3,363,375    
Stockholders’ equity        
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,416,749 and 100,866,589 shares issued at March 31, 2014 and December 31, 2013, respectively 999 996    
Treasury stock, at cost: 238,453 and 167,155 shares at March 31, 2014 and December 31, 2013, respectively (8,387) (5,362)    
Additional paid-in capital 989,525 985,023    
Retained earnings 537,845 367,892    
Total stockholders’ equity 1,519,982 1,348,549    
Total liabilities and stockholders’ equity 4,792,084 4,711,924    
Parent/Issuer [Member]
        
ASSETS        
Cash and cash equivalents 936 34,277 81,836 133,797
Accounts receivable – affiliates 770 770    
Prepaid expenses 159 318    
Other current assets 0      
Total current assets 1,865 35,365    
Property, plant and equipment        
Investments in and advances to subsidiaries 3,621,362 3,450,668    
Deferred income taxes 101,341 85,288    
Deferred costs and other assets 32,862 33,983    
Total assets 3,757,430 3,605,304    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 0 0    
Accounts payable – affiliates 12,802 9,100    
Accrued liabilities 119 33    
Accrued interest payable 24,527 47,622    
Total current liabilities 37,448 56,755    
Long-term debt 2,200,000 2,200,000    
Total liabilities 2,237,448 2,256,755    
Stockholders’ equity        
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,416,749 and 100,866,589 shares issued at March 31, 2014 and December 31, 2013, respectively 999 996    
Treasury stock, at cost: 238,453 and 167,155 shares at March 31, 2014 and December 31, 2013, respectively (8,387) (5,362)    
Additional paid-in capital 989,525 985,023    
Retained earnings 537,845 367,892    
Total stockholders’ equity 1,519,982 1,348,549    
Total liabilities and stockholders’ equity 3,757,430 3,605,304    
Combined Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 55,362 57,624 84,153 79,650
Accounts receivable — oil and gas revenues 202,749 175,653    
Accounts receivable — joint interest partners 134,553 139,459    
Accounts receivable – affiliates 12,802 9,100    
Inventory 19,862 20,652    
Prepaid expenses 24,291 9,873    
Deferred income taxes 8,484 6,335    
Derivative instruments 778 2,264    
Advances to joint interest partners 214 760    
Other current assets 420 391    
Total current assets 459,515 422,111    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 4,820,902 4,528,958    
Other property and equipment 200,158 188,468    
Less: accumulated depreciation, depletion, amortization and impairment (723,429) (637,676)    
Total property, plant and equipment, net 4,297,631 4,079,750    
Assets held for sale   137,066    
Derivative instruments 470 1,333    
Deferred costs and other assets 13,313 12,186    
Total assets 4,770,929 4,652,446    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable 24,516 8,920    
Accounts payable – affiliates 770 770    
Revenues and production taxes payable 183,120 146,741    
Accrued liabilities 282,905 241,797    
Accrued interest payable 35 288    
Derivative instruments 20,663 8,188    
Advances from joint interest partners 10,931 12,829    
Other current liabilities 2,766      
Total current liabilities 525,706 419,533    
Long-term debt 60,000 335,570    
Deferred income taxes 525,390 408,435    
Asset retirement obligations 35,790 35,918    
Derivative instruments 679 139    
Other liabilities 2,002 2,183    
Total liabilities 1,149,567 1,201,778    
Stockholders’ equity        
Capital contributions from affiliates 2,904,739 2,930,978    
Additional paid-in capital 8,743 8,743    
Retained earnings 707,880 510,947    
Total stockholders’ equity 3,621,362 3,450,668    
Total liabilities and stockholders’ equity 4,770,929 4,652,446    
Intercompany Eliminations [Member]
        
ASSETS        
Accounts receivable – affiliates (13,572) (9,870)    
Total current assets (13,572) (9,870)    
Property, plant and equipment        
Investments in and advances to subsidiaries (3,621,362) (3,450,668)    
Deferred income taxes (101,341) (85,288)    
Total assets (3,736,275) (3,545,826)    
LIABILITIES AND STOCKHOLDERS’ EQUITY        
Accounts payable – affiliates (13,572) (9,870)    
Total current liabilities (13,572) (9,870)    
Deferred income taxes (101,341) (85,288)    
Total liabilities (114,913) (95,158)    
Stockholders’ equity        
Capital contributions from affiliates (2,904,739) (2,930,978)    
Additional paid-in capital (8,743) (8,743)    
Retained earnings (707,880) (510,947)    
Total stockholders’ equity (3,621,362) (3,450,668)    
Total liabilities and stockholders’ equity $ (3,736,275) $ (3,545,826)