Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (600)	$ (629)	$ (1,910)	$ (1,868)
Sale of New Jersey state tax benefit	0	0	0	2,898
Investment and other income, net	140	106	420	344
Other income (expense), net	$ (460)	$ (523)	$ (1,490)	$ 1,374