Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (622)	$ (622)	$ (1,310)	$ (1,239)
Sale of New Jersey state tax benefit	0	0	0	2,898
Investment and other income, net	140	117	280	238
Other income (expense), net	$ (482)	$ (505)	$ (1,030)	$ 1,897