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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |
U.S. federal statutory rate | 21.00% | 21.00% | 21.00% | 35.00%
Percentage of income attributable to wholly-owned operations and investments for which income tax expense and effective tax rate calculated | 100.00% | 100.00% | 100.00% |
Valuation allowance | $ 668 | $ 655 |  |
Gross unrecognized tax benefits | 6,505 | 5,367 | $ 4,902 | $ 4,225
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 5,461 | 4,367 |  |
Estimated accrued interest and penalties resulting from unrecognized tax benefits | 982 | $ 855 |  |
Foreign subsidiaries earnings | 85,000 |  |  |
Measurement period estimated net income tax benefit |  |  | 1,819 |
Total net income tax benefit attributable to passage of the TCJA |  |  | $ 11,774 |
State and other |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards | $ 14,427 |  |  |
State and other | Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
State and other net operating loss carry forwards expiration date | 2040 |  |  |
State and other | Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
State and other net operating loss carry forwards expiration date | 2021 |  |  |
Foreign |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards | $ 10,565 |  |  |
Foreign | Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
State and other net operating loss carry forwards expiration date | 2040 |  |  |
Foreign | Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
State and other net operating loss carry forwards expiration date | 2036 |  |  |
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards | $ 0 |  |  |

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