Accumulated Other Comprehensive Income - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 22,815	$ 9,433	$ 9,433	$ 76
Foreign currency translation gain/(loss)	1,329	9,565	13,676	9,742
Actuarial gain/(loss), net of tax	(55)	(26)	(294)	(385)
Ending balance	24,089	18,972	22,815	9,433
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	23,807	10,131	10,131	389
Foreign currency translation gain/(loss)	1,329	9,565	13,676	9,742
Ending balance	25,136	19,696	23,807	10,131
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(992)	(698)	(698)	(313)
Actuarial gain/(loss), net of tax	(55)	(26)	(294)	(385)
Ending balance	$ (1,047)	$ (724)	$ (992)	$ (698)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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