Restructuring and Severance Costs - Lease Termination Restructuring Accrual (Detail) - Facility Closing [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Balance at beginning of year	$ 208	$ 1,277	$ 484
Provision for additional expense	1,004	406	1,525
Payments and adjustments	(695)	(1,475)	(732)
Balance at end of year	$ 517	$ 208	$ 1,277