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Business Segments - Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 6,015,724 | $ 5,758,856
Other Operations |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 176,816 | 172,094
Corporate |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets | [1] | 411,346 | 144,069
Operating Segments | Contract Drilling |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 3,905,159 | 3,931,994
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 1,211,349 | 1,209,424
Operating Segments | Directional Drilling |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 311,054 | $ 301,275
[1] | Corporate assets primarily include cash on hand and certain property and equipment.

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