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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Net balance at January 1	$ 436,679,000	$ 413,640,000
Additions (Note 13)	0	19,917,000
Goodwill, impairment loss	0	0	$ 0
Currency translation	6,593,000	3,122,000
Net balance at December 31	$ 443,272,000	$ 436,679,000	$ 413,640,000

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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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