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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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- 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e31917-109318 + Details
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