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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) |

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