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Business Segments - Identifiable Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 4,609,093 | $ 5,469,866
Corporate |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets | [1] | 240,564 | 314,276
Operating Segments | Contract Drilling |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 3,308,588 | 3,817,638
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 752,267 | 921,237
Operating Segments | Directional Drilling |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 175,534 | 239,341
Other Operations |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 132,140 | $ 177,374
[1] | Corporate assets primarily include cash on hand and certain property and equipment.

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