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Fair Value Disclosures - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 16, 2021	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Equity method investments at fair value	$ 3,652		$ 3,652			$ 6,307
Discontinued Operations, Held-for-sale | CES
Fair Value, Option, Quantitative Disclosures [Line Items]
Goodwill	1,377		1,377		$ 1,700	1,702
Loss on classification as held for sale	325	$ 0	325	$ 0
Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Equity method investments at fair value	$ 3,652		$ 3,652			$ 6,307
Level 3 | Discontinued Operations, Held-for-sale | CES | Fair Value, Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Goodwill, fair value					$ 1,400

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Amount before tax of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a discontinued operation.

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Fair value portion of investments accounted under the equity method.

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