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Company's Demand Deposits and Temporary Cash Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Risks And Uncertainties [Abstract]        
Deposits in FDIC and SIPC-insured institutions under insurance limits $ 13,860 $ 846    
Deposits in FDIC and SIPC-insured institutions over insurance limits 106,849 12,866    
Deposits in foreign banks 21,479 27,557    
Total cash and cash equivalents 142,188 41,269    
Less outstanding checks and other reconciling items (99,360) (6,117)    
Cash and cash equivalents $ 42,828 $ 35,152 $ 113,346 $ 43,012