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Summary of Gross Proceeds and Gross Realized Gains from Sale of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Gain (Loss) on Investments [Line Items]    
Gross proceeds $ 112,676 $ 166,760
Gross realized gains $ 176 $ 260