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Investments ("Held-to-Maturity") - Schedule of Maturity Profile of Investments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity due within one year $ 1,991  
Held-to-maturity due one year through five years 3,026 $ 8,369
Held-to-maturity due five years through ten years 6,041 3,127
Held-to-maturity due over ten years 5,171 12,193
Held-to-maturity cost or amortized cost $ 16,229 $ 23,689