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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |
Corporate tax rate |  | 21.00% | 21.00% | 35.00% |
Amounts related to the remeasurement of federal deferred tax assets and liabilities |  |  | $ 1,200,000 |  |
Amounts related to one-time transition tax on mandatory deemed repatriation of foreign earnings |  |  | 400,000 |  |
Cumulative foreign earnings from tax cuts and jobs act of 2017 |  |  | $ 22,600,000 |  |
Tax Cuts and Jobs Act of 2017, accounting complete |  |  | true |  |
Additional income tax expense due to tax cuts and jobs act of 2017 |  |  | $ 400,000 |  |
Long-term net deferred tax assets |  | $ 1,000,000 | 1,100,000 |  |
Long-term net deferred tax liabilities |  | 22,884,000 | 969,000 |  |
Valuation allowance |  | 2,274,000 | 2,574,000 | $ 2,686,000 | $ 2,193,000
Operating loss carryforwards related to a prior acquisition |  | 3,400,000 |  |  |
U.S. federal and state capital loss carryforwards |  | 5,200,000 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2020 |  | 600,000 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2021 |  | 1,400,000 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2022 |  | 3,200,000 |  |  |
Unremitted earnings of U.S. deferred tax liability of foreign subsidiaries |  | 0 |  |  |
Unremitted earnings |  | 19,200,000 |  |  |
Unrecognized tax benefits |  | 345,000 | $ 799,000 | $ 806,000 | $ 1,774,000
Income tax expense to settle a foreign tax audit |  | 300,000 |  |  |
Maximum [Member] | Scenario, Forecast [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Decrease in unrecognized tax benefits | $ 300,000 |  |  |  |
U.S. Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 18,500,000 |  |  |
Operating loss carryforwards, limitations on use |  | The Act allows U.S. federal net operating loss carryforwards resulting from taxable years beginning after December 31, 2017 to be carried forward indefinitely and can be used to offset 80% of U.S. taxable income. |  |  |
Foreign Tax Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 24,100,000 |  |  |

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