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

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