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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 169,953 $ 51,851
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 91,272 66,261
Gain on sale of properties (183,393) 0
Impairment of oil and gas properties 762 498
Deferred income taxes 98,753 30,987
Derivative instruments 17,603 14,612
Stock-based compensation expenses 4,505 2,289
Debt discount amortization and other 1,487 746
Working capital and other changes:    
Change in accounts receivable (9,275) (3,360)
Change in inventory 790 (8,407)
Change in prepaid expenses (14,259) 293
Change in other current assets (29) (232)
Change in other assets (1,593) 0
Change in accounts payable and accrued liabilities 29,007 15,009
Change in other current liabilities 2,766 0
Change in other liabilities (82) 0
Net cash provided by operating activities 208,267 170,547
Cash flows from investing activities:    
Capital expenditures (280,895) (217,819)
Proceeds from sale of properties 321,943 0
Costs related to sale of properties (2,010) 0
Derivative settlements (2,239) 1,686
Advances from joint interest partners (1,898) (1,691)
Net cash provided by (used in) investing activities 34,901 (217,824)
Cash flows from financing activities:    
Principal payments on revolving credit facility (275,570) 0
Purchases of treasury stock (3,025) (156)
Debt issuance costs 0 (25)
Other (176) 0
Net cash used in financing activities (278,771) (181)
Decrease in cash and cash equivalents (35,603) (47,458)
Beginning of period 91,901 213,447
End of period 56,298 165,989
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 169,953 51,851
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (196,933) (66,243)
Deferred income taxes (16,053) (8,626)
Stock-based compensation expenses 4,428 2,278
Debt discount amortization and other 1,123 644
Working capital and other changes:    
Change in accounts receivable 0 11
Change in prepaid expenses 159 157
Change in other current assets 0 (339)
Change in accounts payable and accrued liabilities (19,307) (8,286)
Net cash provided by operating activities (56,630) (28,553)
Cash flows from investing activities:    
Net cash provided by (used in) investing activities 0  
Cash flows from financing activities:    
Purchases of treasury stock (3,025) (156)
Investment in / capital contributions from affiliates 26,490 (23,252)
Other (176)  
Net cash used in financing activities 23,289 (23,408)
Decrease in cash and cash equivalents (33,341) (51,961)
Beginning of period 34,277 133,797
End of period 936 81,836
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 196,933 66,243
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 91,272 66,261
Gain on sale of properties (183,393)  
Impairment of oil and gas properties 762 498
Deferred income taxes 114,806 39,613
Derivative instruments 17,603 14,612
Stock-based compensation expenses 77 11
Debt discount amortization and other 364 102
Working capital and other changes:    
Change in accounts receivable (12,977) (3,740)
Change in inventory 790 (8,407)
Change in prepaid expenses (14,418) 136
Change in other current assets (29) 107
Change in other assets (1,593)  
Change in accounts payable and accrued liabilities 52,016 23,664
Change in other current liabilities 2,766  
Change in other liabilities (82)  
Net cash provided by operating activities 264,897 199,100
Cash flows from investing activities:    
Capital expenditures (280,895) (217,819)
Proceeds from sale of properties 321,943  
Costs related to sale of properties (2,010)  
Derivative settlements (2,239) 1,686
Advances from joint interest partners (1,898) (1,691)
Net cash provided by (used in) investing activities 34,901 (217,824)
Cash flows from financing activities:    
Principal payments on revolving credit facility (275,570)  
Debt issuance costs   (25)
Investment in / capital contributions from affiliates (26,490) 23,252
Net cash used in financing activities (302,060) 23,227
Decrease in cash and cash equivalents (2,262) 4,503
Beginning of period 57,624 79,650
End of period 55,362 84,153
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (196,933) (66,243)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 196,933 66,243
Working capital and other changes:    
Change in accounts receivable 3,702 369
Change in accounts payable and accrued liabilities $ (3,702) $ (369)