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Goodwill by Operating Segment (Detail) - USD ($) | 12 Months Ended
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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

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