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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Equity [Abstract]        
Unrealized holding gains (losses), tax $ 78 $ 341 $ 593 $ 176
Reclassification adjustment, tax $ 1 $ 0 $ 3 $ (18)