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Business Segment Information - Summarized Financial Information of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Revenues $ 278,358 $ 139,151  
Inter-segment revenues (30,054) (585)  
Total revenues 248,304 138,566  
Operating income 117,953 58,150  
Other income (expense) (35,015) (31,887)  
Income before income taxes 82,938 26,263  
Total assets 2,646,718   2,528,794
Exploration and Production [Member]
      
Segment Reporting Information [Line Items]      
Revenues 242,590 137,907  
Total revenues 242,590 137,907  
Operating income 115,390 60,243  
Other income (expense) (35,019) (31,887)  
Income before income taxes 80,371 28,356  
Total assets 2,574,554   2,475,820
Well Services [Member]
      
Segment Reporting Information [Line Items]      
Revenues 35,768 1,244  
Inter-segment revenues (30,054) (585)  
Total revenues 5,714 659  
Operating income 2,563 (2,093)  
Other income (expense) 4    
Income before income taxes 2,567 (2,093)  
Total assets $ 72,164   $ 52,974