Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Total rent expense and related taxes and operating expenses, under operating leases	$ 7,759	$ 8,409	$ 7,074
Tax reserves, non-income tax related	$ 0	$ 659