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Goodwill by Operating Segment (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Balance at beginning of period $ 611,473,000 $ 86,234,000
Goodwill acquired 9,412,000 525,239,000
Measurement period adjustment 1,000,000  
Impairment (211,129,000)  
Balance at end of period 410,756,000 611,473,000
Contract Drilling    
Goodwill [Line Items]    
Balance at beginning of period 395,060,000 86,234,000
Goodwill acquired 0 308,826,000
Measurement period adjustment 0  
Impairment 0  
Balance at end of period 395,060,000 395,060,000
Pressure Pumping    
Goodwill [Line Items]    
Balance at beginning of period 121,444,000 0
Goodwill acquired 0 121,444,000
Measurement period adjustment 0  
Impairment (121,444,000)  
Balance at end of period 0 121,444,000
Directional Drilling    
Goodwill [Line Items]    
Balance at beginning of period 88,685,000 0
Goodwill acquired 0 88,685,000
Measurement period adjustment 1,000,000  
Impairment (89,685,000)  
Balance at end of period 0 88,685,000
Other Operations    
Goodwill [Line Items]    
Balance at beginning of period 6,284,000 0
Goodwill acquired 9,412,000 6,284,000
Measurement period adjustment 0  
Impairment 0  
Balance at end of period $ 15,696,000 $ 6,284,000