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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Total revenues $ 372,378 $ 254,582 $ 721,897 $ 502,886  
Operating income (loss) 166,545 113,450 495,625 231,403  
Other income (expense) (104,425) (8,507) (162,033) (43,522)  
Income (loss) before income taxes 62,120 104,943 333,592 187,881  
Total assets 5,036,979   5,036,979   4,711,924
Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 354,183 241,842 686,030 483,493  
Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 14,877 11,461 30,704 17,175  
Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 3,318 1,279 5,163 2,218  
Operating Segments [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 426,108 280,259 819,714 562,498  
Operating income (loss) 166,545 113,450 495,625 231,403  
Other income (expense) (104,425) (8,507) (162,033) (43,522)  
Income (loss) before income taxes 62,120 104,943 333,592 187,881  
Total assets 5,036,979   5,036,979   4,711,924
Operating Segments [Member] | Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 354,183 241,842 686,030 483,493  
Operating income (loss) 158,353 105,459 484,886 218,357  
Other income (expense) (104,448) (8,511) (162,108) (43,530)  
Income (loss) before income taxes 53,905 96,948 322,778 174,827  
Total assets 4,844,196   4,844,196   4,532,264
Operating Segments [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 58,447 31,382 110,853 67,150  
Operating income (loss) 6,858 3,310 8,478 5,873  
Other income (expense) 23 4 75 8  
Income (loss) before income taxes 6,881 3,314 8,553 5,881  
Total assets 77,050   77,050   70,708
Operating Segments [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 13,478 7,035 22,831 11,855  
Operating income (loss) 1,334 4,681 2,261 7,173  
Income (loss) before income taxes 1,334 4,681 2,261 7,173  
Total assets 115,733   115,733   108,952
Intersegment Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (53,730) (25,677) (97,817) (59,612)  
Intersegment Eliminations [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (43,570) (19,921) (80,149) (49,975)  
Intersegment Eliminations [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues $ (10,160) $ (5,756) $ (17,668) $ (9,637)