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Summary of Gross Proceeds and Gross Realized Gains from Sale of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Gain (Loss) on Investments [Line Items]    
Gross proceeds $ 104,663 $ 135,211
Gross realized gains $ 163 $ 211