Total Other Income (Expenses) - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income Expense [Line Items]
Other income (expenses), foreign currency transaction gain	$ 2,600	$ 1,900	$ 1,200
Loss on extinguishment of debt	0	1,476	0
Other income (expenses), adjustments	$ 2,657	$ 544	2,306
Sales rebates received			400
Gain related to certain refurbished POS machines			200
Software Indemnification Assets
Other Income Expense [Line Items]
Other income (expenses), adjustments			$ 200