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Business Segments - Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Total operating revenues |  | $ 472,761 | $ 757,276 | $ 1,130,460 | $ 1,435,444
Operating Segments |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Total operating revenues |  | 473,028 | 758,720 | 1,131,490 | 1,437,947
Operating Segments | Contract Drilling |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Total operating revenues |  | 288,588 | 440,027 | 690,829 | 866,989
Operating Segments | Pressure Pumping |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Total operating revenues |  | 176,624 | 306,577 | 426,345 | 546,838
Operating Segments | Oil And Natural Gas |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Total operating revenues |  | 7,816 | 12,116 | 14,316 | 24,120
Intersegment Elimination |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Total operating revenues | [1] | $ (267) | $ (1,444) | $ (1,030) | $ (2,503)
[1] | Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment.

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