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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Reconciliation [Line Items] |  |  |
Net tax provision | $ 10,810,000 | $ 8,122,000 | $ 6,007,000
Cash taxes paid net of refunds | 7,700,000 | 7,800,000 | 5,600,000
Net operating loss carryforwards, indefinite | $ 5,400,000 |  |
Foreign net operating loss carryforwards expiration period start year | 2024 |  |
Foreign net operating loss carryforwards expiration period end year | 2030 |  |
Valuation allowance | $ 2,912,000 | 3,137,000 |
Net decrease in valuation allowance from the prior year | (300,000) |  |
Tax liability, undistributed earnings of foreign subsidiaries | 115,800,000 |  |
Uncertain tax position expired | 52,000 | 0 | 0
Accrued interest |  |  | 0
Accrued penalties |  |  | $ 0
Accrue interest and penalties expire in next twelve months | 100,000 |  |
Maximum [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Accrued interest | 100,000 | 100,000 |
Accrued penalties | 100,000 | $ 100,000 |
Income Tax Provision [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Net decrease in valuation allowance from the prior year | (200,000) |  |
Foreign Country [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Net operating loss carryforwards | 7,000,000.0 |  |
Net operating loss carryforwards, definite | $ 1,600,000 |  |

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