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Goodwill by Operating Segment (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Balance at beginning of period $ 410,756,000 $ 611,473,000
Goodwill acquired   9,412,000
Measurement period adjustment 2,104,000 1,000,000
Impairment (17,800,000) (211,129,000)
Balance at end of period 395,060,000 410,756,000
Contract Drilling    
Goodwill [Line Items]    
Balance at beginning of period 395,060,000 395,060,000
Impairment 0 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
Impairment   (121,444,000)
Directional Drilling    
Goodwill [Line Items]    
Balance at beginning of period   88,685,000
Measurement period adjustment   1,000,000
Impairment   (89,685,000)
Other Operations    
Goodwill [Line Items]    
Balance at beginning of period 15,696,000 6,284,000
Goodwill acquired   9,412,000
Measurement period adjustment 2,104,000  
Impairment $ (17,800,000)  
Balance at end of period   $ 15,696,000