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Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Line Items]
Impairment		$ (17,800)	$ (395,060)	$ (17,800)
Contract Drilling
Goodwill [Line Items]
Balance at beginning of period	$ 395,060		395,060
Impairment	$ (395,000)		$ (395,060)

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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