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Tax Effects Allocated to Accumulated Other Comprehensive Income (Loss) Component (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Other Comprehensive Income (Loss) [Line Items]      
Before-tax amount $ (463) $ (268) $ (262)
Tax benefit (139) (89) (86)
Net-of-tax amount $ (324) $ (179) $ (176)