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Business Segment Information - Summarized Financial Information of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total revenues $ 349,519 $ 248,304  
Operating income (loss) 329,080 117,953  
Other income (expense) (57,608) (35,015)  
Income (loss) before income taxes 271,472 82,938  
Total assets 4,792,084   4,711,924
Exploration and Production [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 331,847 241,652  
Well Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 15,827 5,714  
Midstream Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 1,845 938  
Operating Segments [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 393,606 282,240  
Operating income (loss) 329,080 117,953  
Other income (expense) (57,608) (35,015)  
Income (loss) before income taxes 271,472 82,938  
Total assets 4,792,084   4,711,924
Operating Segments [Member] | Exploration and Production [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 331,847 241,652  
Operating income (loss) 326,533 114,885  
Other income (expense) (57,660) (35,019)  
Income (loss) before income taxes 268,873 79,866  
Total assets 4,603,244   4,532,264
Operating Segments [Member] | Well Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 52,406 35,768  
Operating income (loss) 1,620 2,563  
Other income (expense) 52 4  
Income (loss) before income taxes 1,672 2,567  
Total assets 76,929   70,708
Operating Segments [Member] | Midstream Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 9,353 4,820  
Operating income (loss) 927 505  
Income (loss) before income taxes 927 505  
Total assets 111,911   108,952
Intersegment Eliminations [Member]
      
Segment Reporting Information [Line Items]      
Total revenues (44,087) (33,936)  
Intersegment Eliminations [Member] | Well Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues (36,579) (30,054)  
Intersegment Eliminations [Member] | Midstream Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues $ (7,508) $ (3,882)