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Gains and Losses Related to Derivative Financial Instruments Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Designated as Hedging Instrument | Interest Rate Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains/(Losses) recognized in OCI $ (2) $ 13 $ 241