Business Segments - Depreciation, Amortization and Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 219,328	$ 170,975	$ 375,545	$ 347,745
Other Operations
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	8,120	1,805	10,292	6,537
Corporate
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	1,989	1,368	3,225	2,737
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	161,414	120,402	271,973	241,501
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 47,805	$ 47,400	$ 90,055	$ 96,970