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Business Segment Information - Summarized Financial Information of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Total revenues $ 305,498 $ 184,711 $ 808,384 $ 472,341  
Operating income 150,862 72,038 382,265 190,373  
Other income (expense) (62,648) (42,273) (106,170) (12,863)  
Income before income taxes 88,214 29,765 276,095 177,510  
Total assets 4,083,383   4,083,383   2,528,794
Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 286,952 178,748 770,445 461,857  
Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 17,090 5,963 34,266 10,484  
Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 1,456   3,673    
Operating Segments [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 351,665 215,908 914,162 516,766  
Operating income 150,862 72,038 382,265 190,373  
Other income (expense) (62,648) (42,273) (106,170) (12,863)  
Income before income taxes 88,214 29,765 276,095 177,510  
Total assets 4,083,383   4,083,383   2,528,794
Operating Segments [Member] | Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 286,952 178,748 770,445 461,857  
Operating income 140,765 89,279 359,121 190,257  
Other income (expense) (62,628) (42,273) (106,159) (12,863)  
Income before income taxes 78,137 47,006 252,962 177,394  
Total assets 3,916,554   3,916,554   2,475,820
Operating Segments [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 57,116 37,160 124,266 54,909  
Operating income 5,870 (17,241) 11,744 116  
Other income (expense) (20)   (11)    
Income before income taxes 5,850 (17,241) 11,733 116  
Total assets 68,869   68,869   52,974
Operating Segments [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 7,597   19,451    
Operating income 4,227   11,400    
Income before income taxes 4,227   11,400    
Total assets 97,960   97,960    
Intersegment Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (46,167) (31,197) (105,778) (44,425)  
Intersegment Eliminations [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (40,026) (31,197) (90,000) (44,425)  
Intersegment Eliminations [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues $ (6,141)   $ (15,778)