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Company's Demand Deposits and Temporary Cash Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Risks And Uncertainties [Abstract] |  |  |  |
Deposits in FDIC and SIPC-insured institutions under insurance limits | $ 846 | $ 617 |  |
Deposits in FDIC and SIPC-insured institutions over insurance limits | 12,866 | 130,330 |  |
Deposits in foreign banks | 27,557 | 15,303 |  |
Total cash and cash equivalents | 41,269 | 146,250 |  |
Less outstanding checks and other reconciling items | (6,117) | (32,904) |  |
Cash and cash equivalents | $ 35,152 | $ 113,346 | $ 43,012 | $ 249,509

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