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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Taxes Disclosure [Line Items] |  |  |  |
Income tax provision | $ 1,140,000 | $ 1,077,000 | $ 3,270,000 | $ 2,575,000
Effective tax rate for continuing operations |  |  | 24.00% | 20.00%
Accounting Standards Update 2016-09 [Member] |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Excess tax benefits primarily from stock option exercises |  |  | $ 130,000 | $ 692,000

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