Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Statement of Income (Detail)

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Condensed Consolidating Statement of Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Condensed Financial Statements Captions [Line Items]        
Revenues $ 235,383 $ 215,513 $ 494,605 $ 451,399
Operating costs and expenses:        
Lease operating expenses 68,248 60,276 127,590 116,938
Production taxes 1,780 1,335 3,569 2,821
Gathering and transportation 4,608 4,110 9,052 8,330
Depreciation, depletion, amortization and accretion 99,896 85,941 208,767 174,432
General and administrative expenses 19,868 14,623 40,955 44,102
Derivative gain (12,840) (49,872) (9,473) (10,238)
Total costs and expenses 181,560 116,413 380,460 336,385
Operating income 53,823 99,100 114,145 115,014
Interest expense:        
Incurred 21,536 14,706 42,770 28,612
Capitalized (2,532) (3,326) (4,964) (6,517)
Income before income tax expense 34,819 87,720 76,339 92,919
Income tax expense 12,423 34,153 27,325 36,134
Net income 22,396 53,567 49,014 56,785
Parent Company
        
Condensed Financial Statements Captions [Line Items]        
Revenues 185,899 155,595 395,428 332,157
Operating costs and expenses:        
Lease operating expenses 64,977 53,490 119,507 103,507
Production taxes 1,780 1,335 3,569 2,821
Gathering and transportation 3,731 3,221 7,393 6,704
Depreciation, depletion, amortization and accretion 77,951 63,459 164,366 131,082
General and administrative expenses 18,758 14,623 38,363 41,510
Derivative gain (12,840) (49,872) (9,473) (10,238)
Total costs and expenses 154,357 86,256 323,725 275,386
Operating income 31,542 69,339 71,703 56,771
Earnings of affiliates 14,456 19,328 27,556 37,844
Interest expense:        
Incurred 21,536 14,706 42,770 28,612
Capitalized (2,532) (3,326) (4,964) (6,517)
Income before income tax expense 26,994 77,287 61,453 72,520
Income tax expense 4,598 23,720 12,439 15,735
Net income 22,396 53,567 49,014 56,785
Guarantor Subsidiaries
        
Condensed Financial Statements Captions [Line Items]        
Revenues 49,484 59,918 99,177 119,242
Operating costs and expenses:        
Lease operating expenses 3,271 6,786 8,083 13,431
Gathering and transportation 877 889 1,659 1,626
Depreciation, depletion, amortization and accretion 21,945 22,482 44,401 43,350
General and administrative expenses 1,110   2,592 2,592
Total costs and expenses 27,203 30,157 56,735 60,999
Operating income 22,281 29,761 42,442 58,243
Interest expense:        
Income before income tax expense 22,281 29,761 42,442 58,243
Income tax expense 7,825 10,433 14,886 20,399
Net income 14,456 19,328 27,556 37,844
Eliminations
        
Operating costs and expenses:        
Earnings of affiliates (14,456) (19,328) (27,556) (37,844)
Interest expense:        
Income before income tax expense (14,456) (19,328) (27,556) (37,844)
Net income $ (14,456) $ (19,328) $ (27,556) $ (37,844)