Business Segments - Assets (Detail) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
||
---|---|---|---|---|---|
Segment Reporting Asset Reconciling Item [Line Items] | |||||
Total assets | $ 5,758,856 | $ 3,772,291 | $ 4,465,048 | ||
Other Operations | |||||
Segment Reporting Asset Reconciling Item [Line Items] | |||||
Total assets | 172,094 | 48,885 | 38,726 | ||
Corporate | |||||
Segment Reporting Asset Reconciling Item [Line Items] | |||||
Total assets | [1] | 144,069 | 36,957 | 155,574 | |
Operating Segments | Contract Drilling | |||||
Segment Reporting Asset Reconciling Item [Line Items] | |||||
Total assets | 3,931,994 | 3,032,819 | 3,457,044 | ||
Operating Segments | Pressure Pumping | |||||
Segment Reporting Asset Reconciling Item [Line Items] | |||||
Total assets | 1,209,424 | $ 653,630 | $ 813,704 | ||
Operating Segments | Directional Drilling | |||||
Segment Reporting Asset Reconciling Item [Line Items] | |||||
Total assets | $ 301,275 | ||||
|