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Business Segment Information - Summarized Financial Information of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Total revenues $ 254,582 $ 149,064 $ 502,886 $ 287,630  
Operating income 113,450 60,185 231,403 118,335  
Other income (expense) (8,507) 61,297 (43,522) 29,410  
Income before income taxes 104,943 121,482 187,881 147,745  
Total assets 2,758,144   2,758,144   2,528,794
Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 241,842 145,203 483,493 283,109  
Total assets 2,617,366   2,617,366   2,475,820
Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 11,461 3,861 17,175 4,521  
Total assets 52,209   52,209   52,974
Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 1,279   2,218    
Total assets 88,569   88,569    
Operating Segments [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 280,259 161,708 562,498 300,858  
Operating income 113,450 60,185 231,403 118,335  
Other income (expense) (8,507) 61,297 (43,522) 29,410  
Income before income taxes 104,943 121,482 187,881 147,745  
Operating Segments [Member] | Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 241,842 145,203 483,493 283,109  
Operating income 105,459 58,735 218,357 100,978  
Other income (expense) (8,511) 61,297 (43,530) 29,410  
Income before income taxes 96,948 120,032 174,827 130,388  
Operating Segments [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 31,382 16,505 67,150 17,749  
Operating income 3,310 1,450 5,873 17,357  
Other income (expense) 4   8    
Income before income taxes 3,314 1,450 5,881 17,357  
Operating Segments [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 7,035   11,855    
Operating income 4,681   7,173    
Income before income taxes 4,681   7,173    
Intersegment Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (25,677) (12,644) (59,612) (13,228)  
Intersegment Eliminations [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (19,921) (12,644) (49,975) (13,228)  
Intersegment Eliminations [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues $ (5,756)   $ (9,637)