Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Net unrealized loss on available-for-sale securities, net of income tax benefit of $129 and $108, respectively	$ (194)	$ (172)
Net unrealized gain on interest rate swap, net of income tax expense of $196 and $91, respectively	333	151
Foreign currency translation	(643)	(612)
Accumulated other comprehensive loss	$ (504)	$ (633)