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Consolidating Financial Statements - Schedule of Consolidating Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Current assets          
Cash and cash equivalents $ 91,901 $ 213,447 $ 470,872 $ 143,520 $ 143,520
Short-term investments 0 25,891      
Accounts receivable — oil and gas revenues 175,653 110,341      
Accounts receivable — joint interest partners 139,459 99,194      
Inventory 20,652 20,707      
Prepaid expenses 10,191 1,770      
Advances to joint interest partners 760 1,985      
Derivative instruments 2,264 19,016      
Deferred income taxes 6,335 (4,600)      
Other current assets 391 335      
Total current assets 447,606 492,686      
Property, plant and equipment          
Oil and gas properties (successful efforts method) 4,528,958 2,348,128      
Other property and equipment 188,468 49,732      
Less: accumulated depreciation, depletion, amortization and impairment (637,676) (391,260)      
Total property, plant and equipment, net 4,079,750 2,006,600      
Assets held for sale 137,066 0      
Derivative instruments 1,333 4,981      
Deferred costs and other assets 46,169 24,527      
Total assets 4,711,924 2,528,794      
LIABILITIES AND STOCKHOLDERS’ EQUITY          
Accounts payable 8,920 12,491      
Advances from joint interest partners 12,829 21,176      
Revenues and production taxes payable 146,741 71,553      
Accrued liabilities 241,830 189,863      
Accrued interest payable 47,910 30,096      
Derivative instruments 8,188 1,048      
Deferred income taxes 0 4,558      
Total current liabilities 466,418 330,785      
Long-term debt 2,535,570 1,200,000      
Asset retirement obligations 35,918 22,956      
Derivative instruments 139 380      
Deferred income taxes 323,147 177,671      
Other liabilities 2,183 1,997      
Total liabilities 3,363,375 1,733,789      
Stockholders’ equity          
Common stock, $0.01 par value; 300,000,000 shares authorized; 92,483,393 issued and 92,460,914 outstanding 996 925      
Treasury stock, at cost; 167,155 shares and 129,414 shares at December 31, 2013 and 2012, respectively (5,362) (3,796)      
Additional paid-in-capital 985,023 657,943      
Retained earnings 367,892 139,933      
Total stockholders’ equity 1,348,549 795,005 634,238 551,794  
Total liabilities and stockholders’ equity 4,711,924 2,528,794      
Parent/Issuer [Member]
          
Current assets          
Cash and cash equivalents 34,277 133,797 443,482 119,940  
Short-term investments   25,891      
Accounts receivable - affiliates 770 310      
Prepaid expenses 318 313      
Other current assets 0 235      
Total current assets 35,365 160,546      
Property, plant and equipment          
Investments in and advances to subsidiaries 3,450,668 1,807,010      
Deferred income taxes 85,288 42,746      
Deferred costs and other assets 33,983 20,748      
Total assets 3,605,304 2,031,050      
LIABILITIES AND STOCKHOLDERS’ EQUITY          
Accounts payable 0 9      
Accounts payable - affiliates 9,100 5,845      
Accrued liabilities 33 100      
Accrued interest payable 47,622 30,091      
Total current liabilities 56,755 36,045      
Long-term debt 2,200,000 1,200,000      
Total liabilities 2,256,755 1,236,045      
Stockholders’ equity          
Common stock, $0.01 par value; 300,000,000 shares authorized; 92,483,393 issued and 92,460,914 outstanding 996 925      
Treasury stock, at cost; 167,155 shares and 129,414 shares at December 31, 2013 and 2012, respectively (5,362) (3,796)      
Additional paid-in-capital 985,023 657,943      
Retained earnings 367,892 139,933      
Total stockholders’ equity 1,348,549 795,005      
Total liabilities and stockholders’ equity 3,605,304 2,031,050      
Combined Guarantor Subsidiaries [Member]
          
Current assets          
Cash and cash equivalents 57,624 79,650 27,390 23,580  
Accounts receivable — oil and gas revenues 175,653 110,341      
Accounts receivable — joint interest partners 139,459 99,194      
Accounts receivable - affiliates 9,100 5,845      
Inventory 20,652 20,707      
Prepaid expenses 9,873 1,457      
Advances to joint interest partners 760 1,985      
Derivative instruments 2,264 19,016      
Deferred income taxes 6,335        
Other current assets 391 100      
Total current assets 422,111 338,295      
Property, plant and equipment          
Oil and gas properties (successful efforts method) 4,528,958 2,348,128      
Other property and equipment 188,468 49,732      
Less: accumulated depreciation, depletion, amortization and impairment (637,676) (391,260)      
Total property, plant and equipment, net 4,079,750 2,006,600      
Assets held for sale 137,066        
Derivative instruments 1,333 4,981      
Deferred costs and other assets 12,186 3,779      
Total assets 4,652,446 2,353,655      
LIABILITIES AND STOCKHOLDERS’ EQUITY          
Accounts payable 8,920 12,482      
Accounts payable - affiliates 770 310      
Advances from joint interest partners 12,829 21,176      
Revenues and production taxes payable 146,741 71,553      
Accrued liabilities 241,797 189,763      
Accrued interest payable 288 5      
Derivative instruments 8,188 1,048      
Deferred income taxes   4,558      
Total current liabilities 419,533 300,895      
Long-term debt 335,570        
Asset retirement obligations 35,918 22,956      
Derivative instruments 139 380      
Deferred income taxes 408,435 220,417      
Other liabilities 2,183 1,997      
Total liabilities 1,201,778 546,645      
Stockholders’ equity          
Capital contributions from affiliates 2,930,978 1,586,780      
Additional paid-in-capital 8,743 8,743      
Retained earnings 510,947 211,487      
Total stockholders’ equity 3,450,668 1,807,010      
Total liabilities and stockholders’ equity 4,652,446 2,353,655      
Intercompany Eliminations [Member]
          
Current assets          
Accounts receivable - affiliates (9,870) (6,155)      
Total current assets (9,870) (6,155)      
Property, plant and equipment          
Investments in and advances to subsidiaries (3,450,668) (1,807,010)      
Deferred income taxes (85,288) (42,746)      
Total assets (3,545,826) (1,855,911)      
LIABILITIES AND STOCKHOLDERS’ EQUITY          
Accounts payable - affiliates (9,870) (6,155)      
Total current liabilities (9,870) (6,155)      
Deferred income taxes (85,288) (42,746)      
Total liabilities (95,158) (48,901)      
Stockholders’ equity          
Capital contributions from affiliates (2,930,978) (1,586,780)      
Additional paid-in-capital (8,743) (8,743)      
Retained earnings (510,947) (211,487)      
Total stockholders’ equity (3,450,668) (1,807,010)      
Total liabilities and stockholders’ equity $ (3,545,826) $ (1,855,911)