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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]        
Unrealized holding gains (losses), tax $ 126 $ (457) $ 515 $ (164)
Reclassification adjustment, tax     $ 2 $ (18)