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Financial Instruments (Bonds) - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items] |  |
Corporate and municipal bonds | $ 58,900 | $ 55,700
Maturity dates of bonds, start date | 2020-01 |
Maturity dates of bonds, end date | 2024-02 |
Funds held for clients | $ 179,502 | 161,289
Certified Deposits and Other Depository Assets [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Funds held for clients | $ 2,500 | $ 2,300

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