Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 212,384	$ 219,328	$ 422,276	$ 375,545
Other Operations
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	9,829	8,120	19,143	10,292
Corporate
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	1,881	1,989	4,118	3,225
Operating Segments \| Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	130,938	161,414	261,855	271,973
Operating Segments \| Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	57,862	$ 47,805	114,384	$ 90,055
Operating Segments \| Directional Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 11,874		$ 22,776