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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Liability for deferred taxes on undistributed foreign earnings | $ 0.9 |  |
Other information pertaining to income taxes | Federal net operating losses of $0.1 million will expire in 2037 |  |
State and local net operating loss carry forwards year start | 2021 |  |
State and local net operating loss carry forwards year end | 2040 |  |
Valuation reserve | $ 6.0 | $ 5.8 |
Additional income tax expense (benefit) | $ (0.2) | 0.2 | $ 1.5
Income tax positions recognized, minimum percentage | 50.00% |  |
Expense for interest and penalties | $ 0.0 | $ 0.1 |
Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forward | 0.6 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forward | 49.4 |  |
Overseas Jurisdictions [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forward | $ 10.3 |  |
State and Foreign Authorities [Member] |  |  |
Income Taxes [Line Items] |  |  |
Open tax years | 2015 2016 2017 2018 2019 2020 |  |

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