Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (688)	$ (617)
Sale of New Jersey state tax benefit	0	2,898
Investment and other income, net	140	121
Other income (expense), net	$ (548)	$ 2,402