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Company's Demand Deposits and Temporary Cash Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Risks And Uncertainties [Abstract] |  |  |  |
Deposits in FDIC and SIPC-insured institutions under insurance limits | $ 1,250 | $ 750 |  |
Deposits in FDIC and SIPC-insured institutions over insurance limits | 179,375 | 229,132 |  |
Deposits in foreign banks | 2,309 | 22,698 |  |
Total cash and cash equivalents | 182,934 | 252,580 |  |
Less outstanding checks and other reconciling items | (8,749) | (7,551) |  |
Cash and cash equivalents | $ 174,185 | $ 245,029 | $ 42,828 | $ 35,152

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