Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (597)	$ (688)
Investment and other income, net	285	140
Other income (expense), net	$ (312)	$ (548)