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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, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 51,851 $ 16,441
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries      
Depreciation, depletion and amortization 66,261 38,886
Impairment of oil and gas properties 498 368
Deferred income taxes 30,987 9,822
Derivative instruments 14,612 18,586
Stock-based compensation expenses 2,289 1,591
Debt discount amortization and other 746 648
Working capital and other changes:    
Change in accounts receivable (3,360) (26,038)
Change in inventory (8,407) (9,641)
Change in prepaid expenses 293 31
Change in other current assets (232) 483
Change in accounts payable and accrued liabilities 15,009 10,775
Change in other current liabilities   (188)
Change in other liabilities   1,001
Net cash provided by operating activities 170,547 62,765
Cash flows from investing activities:    
Capital expenditures (217,678) (269,975)
Derivative settlements 1,686 (1,291)
Redemptions of short-term investments   19,994
Advances to joint interest partners (141) 655
Advances from joint interest partners (1,691) 5,484
Net cash used in investing activities (217,824) (245,133)
Cash flows from financing activities:    
Purchases of treasury stock (156) (1,181)
Debt issuance costs (25) (25)
Investment in / capital contributions from affiliates      
Net cash used in financing activities (181) (1,206)
Increase (decrease) in cash and cash equivalents (47,458) (183,574)
Cash and cash equivalents at beginning of period 213,447 470,872
Cash and cash equivalents at end of period 165,989 287,298
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 51,851 16,441
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (66,243) (26,264)
Deferred income taxes (8,626) (5,863)
Stock-based compensation expenses 2,278 1,591
Debt discount amortization and other 644 480
Working capital and other changes:    
Change in accounts receivable 11  
Change in prepaid expenses 157 155
Change in other current assets (339) 10
Change in accounts payable and accrued liabilities (8,286) 904
Net cash provided by operating activities (28,553) (12,546)
Cash flows from investing activities:    
Redemptions of short-term investments   19,994
Net cash used in investing activities   19,994
Cash flows from financing activities:    
Purchases of treasury stock (156) (1,181)
Investment in / capital contributions from affiliates (23,252) (156,315)
Net cash used in financing activities (23,408) (157,496)
Increase (decrease) in cash and cash equivalents (51,961) (150,048)
Cash and cash equivalents at beginning of period 133,797 443,482
Cash and cash equivalents at end of period 81,836 293,434
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 66,243 26,264
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries      
Depreciation, depletion and amortization 66,261 38,886
Impairment of oil and gas properties 498 368
Deferred income taxes 39,613 15,685
Derivative instruments 14,612 18,586
Stock-based compensation expenses 11  
Debt discount amortization and other 102 168
Working capital and other changes:    
Change in accounts receivable (3,740) (27,768)
Change in inventory (8,407) (9,641)
Change in prepaid expenses 136 (124)
Change in other current assets 107 473
Change in accounts payable and accrued liabilities 23,664 11,601
Change in other current liabilities   (188)
Change in other liabilities   1,001
Net cash provided by operating activities 199,100 75,311
Cash flows from investing activities:    
Capital expenditures (217,678) (269,975)
Derivative settlements 1,686 (1,291)
Advances to joint interest partners (141) 655
Advances from joint interest partners (1,691) 5,484
Net cash used in investing activities (217,824) (265,127)
Cash flows from financing activities:    
Debt issuance costs (25) (25)
Investment in / capital contributions from affiliates 23,252 156,315
Net cash used in financing activities 23,227 156,290
Increase (decrease) in cash and cash equivalents 4,503 (33,526)
Cash and cash equivalents at beginning of period 79,650 27,390
Cash and cash equivalents at end of period 84,153 (6,136)
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (66,243) (26,264)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 66,243 26,264
Working capital and other changes:    
Change in accounts receivable 369 1,730
Change in accounts payable and accrued liabilities $ (369) $ (1,730)