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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Net unrealized loss on available-for-sale securities, net of income tax benefit of $157 and $129, respectively $ (236) $ (194)
Net unrealized gain on interest rate swap, net of income tax expense of $419 and $196, respectively 712 333
Foreign currency translation (658) (643)
Accumulated other comprehensive loss $ (182) $ (504)