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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets net	$ 537		$ 560
Tax credit carryforward, amount			$ 34,400	$ 28,100
Tax credit carryforward expiration period			2026 years
Effective tax rate			28.60%	27.20%
Foreign tax authority [Member]
Tax credit carryforward, amount			$ 8,800	$ 6,300
Tax credit carryforward expiration period			2022 years
Effective tax rate	20.00%
Domestic tax authority [Member]
Effective tax rate	22.00%	25.63%
Maximum [Member]
Percentage of valuation allowance against deferred tax asset			50.00%	50.00%

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Percentage of valuation allowance against deferred tax asset.

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Tax credit carryforward expiration period.

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e31931-109318

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 12
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- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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-Publisher FASB
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