Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrealized Net Gains (Losses) on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Unrealized net gains (losses), taxes (benefits)			$ 88	$ 79
Foreign Exchange Contract [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Unrealized net gains (losses), taxes (benefits)	$ 463	$ 166
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Unrealized net gains (losses), taxes (benefits)				$ (179)