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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill	$ 0			$ 0
Goodwill impairment charge	0	$ 0		0	$ 395,060,000
Amortization expense on intangible assets	$ 3,100,000	$ 5,300,000		$ 9,400,000	$ 15,900,000
Contract Drilling
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill impairment charge			$ 395,000,000

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- Definition

Goodwill and intangible assets disclosure.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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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.

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