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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) |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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