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Business Segments - Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | $ 5,469,866 | $ 5,758,856 | $ 3,772,291
Other Operations |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 177,374 | 172,094 | 48,885
Corporate |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets | [1] | 314,276 | 144,069 | 36,957
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 3,817,638 | 3,931,994 | 3,032,819
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 921,237 | 1,209,424 | $ 653,630
Operating Segments | Directional Drilling |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | $ 239,341 | $ 301,275 |
[1] | Corporate assets primarily include cash on hand and certain property and equipment.

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