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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, 2017
Mar. 31, 2016
Equity [Abstract]    
Unrealized holding gains, tax $ 196 $ 387
Reclassification adjustment, tax $ 0 $ (2)