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Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Goodwill [Line Items]
Balance at beginning of period		$ 410,756
Changes to goodwill		2,104
Impairment	$ (17,800)	(17,800)
Balance at end of period	395,060	395,060
Contract Drilling
Goodwill [Line Items]
Balance at beginning of period		395,060
Balance at end of period	$ 395,060	395,060
Other Operations
Goodwill [Line Items]
Balance at beginning of period		15,696
Changes to goodwill		2,104
Impairment		$ (17,800)

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.

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