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Business Segments - Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 3,908,873 | $ 4,529,484
Operating Segments | Contract Drilling |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 3,113,229 | 3,457,044
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 677,100 | 813,704
Operating Segments | Oil and Natural Gas |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 31,347 | 34,073
Corporate and other |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets | [1] | $ 87,197 | $ 224,663
[1] | Corporate and other assets primarily include cash on hand, income tax receivables, certain deferred tax assets and the assets of a business acquired in September 2016 that designs, manufactures, repairs and services pipe handling equipment and other rig components, including top drives and tubular tongs.

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