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Goodwill by Operating Segment (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Balance at beginning of period | $ 395,060,000 | $ 410,756,000 |
Measurement period adjustment |  | 2,104,000 |
Impairment | (395,060,000) | (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 | $ (395,060,000) | 0 | 0
Balance at end of period |  | 395,060,000 | 395,060,000
Other Operations |  |  |
Goodwill [Line Items] |  |  |
Balance at beginning of period |  | 15,696,000 |
Measurement period adjustment |  | 2,104,000 |
Impairment |  | $ (17,800,000) |
Balance at end of period |  |  | $ 15,696,000

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