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Business Segments - Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Total operating revenues |  | $ 268,939 | $ 657,699
Operating Segments |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Total operating revenues |  | 269,037 | 658,462
Operating Segments | Contract Drilling |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Total operating revenues |  | 168,757 | 402,241
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Total operating revenues |  | 96,313 | 249,721
Operating Segments | Oil and Natural Gas |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Total operating revenues |  | 3,967 | 6,500
Intersegment Elimination |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Total operating revenues | [1] | $ (98) | $ (763)
[1] | Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment.

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