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Goodwill by Operating Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Balance at beginning of period $ 86,234 $ 86,234
Goodwill acquired 525,239 0
Balance at end of period 611,473 86,234
Contract Drilling    
Goodwill [Line Items]    
Balance at beginning of period 86,234 86,234
Goodwill acquired 308,826 0
Balance at end of period 395,060 86,234
Pressure Pumping    
Goodwill [Line Items]    
Balance at beginning of period 0 0
Goodwill acquired 121,444 0
Balance at end of period 121,444 0
Directional Drilling    
Goodwill [Line Items]    
Balance at beginning of period 0 0
Goodwill acquired 88,685 0
Balance at end of period 88,685 0
Oilfield Rental    
Goodwill [Line Items]    
Balance at beginning of period 0 0
Goodwill acquired 6,284 0
Balance at end of period $ 6,284 $ 0