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Accumulated Other Comprehensive Loss - Schedule of Changes in Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]    
Unrealized holding gains (losses), tax $ 387 $ 294
Reclassification adjustment, tax $ 2 $ (18)