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Income Taxes - Differences Between the Provision for Income Taxes at the U.S. Federal Statutory Rate and the Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
U. S. federal statutory tax rate | 21.00% | 21.00% | 35.00%
Federal tax at statutory rate | $ 6,606 | $ 6,843 | $ 9,033
State and local taxes, net of federal benefit | 308 | 273 | 82
U.S. federal permanent items | 621 | 240 | (60)
Global intangible low-taxed income | 1,738 | 1,721 | (116)
Foreign tax credits | (1,422) | (1,707) | 0
Transition tax | 0 | (1,780) | 2,592
Non-U.S. tax rate variances | 929 | 1,011 | (1,491)
Valuation allowance | (346) | (57) | 88
Tax credits | (464) | (295) | (255)
Tax act impact, deferred rate | 0 | (680) | 3,161
Other, net | 152 | 438 | 118
Income taxes | $ 8,122 | $ 6,007 | $ 13,152

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