Income Tax - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unremitted earnings from foreign subsidiaries	$ 74.2
Gross deferred tax asset	17.3	$ 12.8
Gross deferred tax liability	$ 16.2	$ 15.0

Amount of deferred tax liability attributable to taxable temporary differences.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant