Business Segments - Depreciation, Amortization and Improvement (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 864,759	$ 718,730	$ 597,469
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	618,434	524,023	438,728
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	214,552	147,595	129,984
Operating Segments | Oil And Natural Gas
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	26,301	42,576	24,400
Corporate and other
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 5,472	$ 4,536	$ 4,357