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
Mar. 31, 2014
Mar. 31, 2013
Condensed Financial Statements Captions [Line Items]    
Revenues $ 254,516 $ 259,222
Operating costs and expenses:    
Lease operating expenses 55,617 59,341
Production taxes 1,992 1,789
Gathering and transportation 5,296 4,444
Depreciation, depletion, amortization and accretion 123,306 108,872
General and administrative expenses 23,588 21,087
Derivative loss 7,492 3,368
Total costs and expenses 217,291 198,901
Operating income 37,225 60,321
Interest expense:    
Incurred 21,460 21,234
Capitalized (2,072) (2,433)
Income before income tax expense 17,837 41,520
Income tax expense 6,648 14,902
Net income 11,189 26,618
Parent Company
    
Condensed Financial Statements Captions [Line Items]    
Revenues 176,657 209,528
Operating costs and expenses:    
Lease operating expenses 46,148 54,529
Production taxes 1,992 1,789
Gathering and transportation 3,984 3,662
Depreciation, depletion, amortization and accretion 81,105 86,416
General and administrative expenses 21,364 19,604
Derivative loss 7,492 3,368
Total costs and expenses 162,085 169,368
Operating income 14,572 40,160
Earnings of affiliates 14,751 13,100
Interest expense:    
Incurred 21,293 21,234
Capitalized (1,905) (2,433)
Income before income tax expense 9,935 34,459
Income tax expense (1,254) 7,841
Net income 11,189 26,618
Guarantor Subsidiaries
    
Condensed Financial Statements Captions [Line Items]    
Revenues 77,859 49,694
Operating costs and expenses:    
Lease operating expenses 9,469 4,812
Gathering and transportation 1,312 782
Depreciation, depletion, amortization and accretion 42,201 22,456
General and administrative expenses 2,224 1,483
Total costs and expenses 55,206 29,533
Operating income 22,653 20,161
Interest expense:    
Incurred 167  
Capitalized (167)  
Income before income tax expense 22,653 20,161
Income tax expense 7,902 7,061
Net income 14,751 13,100
Eliminations
    
Operating costs and expenses:    
Earnings of affiliates (14,751) (13,100)
Interest expense:    
Income before income tax expense (14,751) (13,100)
Net income $ (14,751) $ (13,100)