Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Net unrealized loss on available-for-sale securities, net of income tax benefit of $183 and $157, respectively	$ (495)	$ (236)
Net unrealized gain on interest rate swap, net of income tax expense of $213 and $419, respectively	694	712
Foreign currency translation	(681)	(658)
Accumulated other comprehensive loss	$ (482)	$ (182)