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Company's Demand Deposits and Temporary Cash Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Risks And Uncertainties [Abstract] |  |  |  |
Deposits in FDIC and SIPC-insured institutions under insurance limits | $ 1,000 | $ 1,250 |  |
Deposits in FDIC and SIPC-insured institutions over insurance limits | 227,961 | 179,375 |  |
Deposits in foreign banks | 1,966 | 2,309 |  |
Total cash and cash equivalents | 230,927 | 182,934 |  |
Less outstanding checks and other reconciling items | (6,012) | (8,749) |  |
Cash and cash equivalents | $ 224,915 | $ 174,185 | $ 245,029 | $ 42,828

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