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Business Segments - Identifiable Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | $ 4,439,615 | $ 5,469,866 | $ 5,758,856
Corporate |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets | [1] | 261,019 | 314,276 | 144,069
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 3,190,463 | 3,817,638 | 3,931,994
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 695,570 | 921,237 | 1,209,424
Operating Segments | Directional Drilling |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 164,273 | 239,341 | 301,275
Other Operations |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | $ 128,290 | $ 177,374 | $ 172,094
[1] | Corporate assets primarily include cash on hand and certain property and equipment.

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