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Financial Instruments (Available-for-sale Debt Securities) - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items] |  |
Corporate and municipal bonds | $ 29,400 | $ 58,900
Maturity dates of bonds, start date | 2020-10 |
Maturity dates of bonds, end date | 2024-11 |
Unrealized losses on securities | $ 100 |
Funds held for clients | $ 123,755 | 179,502
Certified Deposits and Other Depository Assets [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Funds held for clients |  | $ 2,500

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