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Business Segment Information - Summarized Financial Information of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Revenues                 $ 752,972    
Inter-segment revenues                 (66,304)    
Total revenues 214,327 184,710 149,063 138,566 116,876 87,596 67,206 58,744 686,668 330,422 128,927
Operating income 86,619 72,038 60,184 58,152 54,336 40,273 32,414 25,544 276,993 152,567 21,993
Other income (expense)                 (31,119) (26,388) (8,726)
Income before income taxes                 245,874 126,179 13,267
Total assets 2,528,794       1,727,382       2,528,794 1,727,382  
Capital expenditures                 1,148,574    
Depreciation, depletion and amortization                 206,734 74,981 37,832
Exploration and Production [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 670,491    
Total revenues                 670,491    
Operating income                 276,740    
Other income (expense)                 (31,120)    
Income before income taxes                 245,620    
Total assets 2,475,820               2,475,820    
Capital expenditures                 1,132,895    
Depreciation, depletion and amortization                 206,127    
Well Services [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 82,481    
Inter-segment revenues                 (66,304)    
Total revenues                 16,177    
Operating income                 253    
Other income (expense)                 1    
Income before income taxes                 254    
Total assets 52,974               52,974    
Capital expenditures                 15,679    
Depreciation, depletion and amortization                 $ 607