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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, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 368,659 | $ 305,498 | $ 1,090,556 | $ 808,384 |
Operating income (loss) | 134,103 | 150,862 | 629,728 | 382,265 |
Other income (expense) | 63,968 | (62,648) | (98,065) | (106,170) |
Income (loss) before income taxes | 198,071 | 88,214 | 531,663 | 276,095 |
Total assets | 5,457,475 |  | 5,457,475 |  | 4,711,924
Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 344,706 | 286,952 | 1,030,735 | 770,445 |
Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 87,223 | 57,116 | 198,077 | 124,266 |
Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 13,624 | 7,597 | 36,455 | 19,451 |
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 368,659 | 305,498 | 1,090,556 | 808,384 |
Operating income (loss) | 134,103 | 150,862 | 629,728 | 382,265 |
Other income (expense) | 63,968 | (62,648) | (98,065) | (106,170) |
Income (loss) before income taxes | 198,071 | 88,214 | 531,663 | 276,095 |
Total assets | 5,457,475 |  | 5,457,475 |  | 4,711,924
Operating Segments [Member] | Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 344,706 | 286,952 | 1,030,735 | 770,445 |
Operating income (loss) | 126,184 | 140,765 | 602,797 | 359,121 |
Other income (expense) | 63,968 | (62,628) | (98,140) | (106,159) |
Income (loss) before income taxes | 190,152 | 78,137 | 504,657 | 252,962 |
Total assets | 5,344,775 |  | 5,344,775 |  | 4,592,140
Operating Segments [Member] | Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 20,925 | 17,090 | 51,630 | 34,266 |
Operating income (loss) | 23,388 | 19,094 | 53,137 | 39,513 |
Other income (expense) | 0 | (20) | 75 | (11) |
Income (loss) before income taxes | 23,388 | 19,074 | 53,212 | 39,502 |
Total assets | 212,131 |  | 212,131 |  | 78,359
Operating Segments [Member] | Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 3,028 | 1,456 | 8,191 | 3,673 |
Operating income (loss) | 5,126 | 4,394 | 15,854 | 11,790 |
Income (loss) before income taxes | 5,126 | 4,394 | 15,854 | 11,790 |
Total assets | 157,209 |  | 157,209 |  | 117,641
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (76,894) | (46,167) | (174,711) | (105,778) |
Operating income (loss) | (20,595) | (13,391) | (42,060) | (28,159) |
Income (loss) before income taxes | (20,595) | (13,391) | (42,060) | (28,159) |
Total assets | (256,640) |  | (256,640) |  | (76,216)
Segment Reconciling Items [Member] | Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 66,298 | 40,026 | 146,447 | 90,000 |
Segment Reconciling Items [Member] | Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 10,596 | $ 6,141 | $ 28,264 | $ 15,778 |

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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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