Accrued Liabilities - Accrued Severance and Restructuring Balances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Restructuring Reserve	$ 1,581	$ 1,474
Charges	2,701	1,495	$ 983
Cash Paid	(2,926)	(1,388)
Restructuring Reserve	1,356	1,581	1,474
Severance costs
Restructuring Reserve [Roll Forward]
Restructuring Reserve	1,581	1,474
Charges	2,701	1,495
Cash Paid	(2,926)	(1,388)
Restructuring Reserve	1,356	1,581	1,474
Restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring Reserve	0	0
Charges	0	0
Cash Paid	0	0
Restructuring Reserve	$ 0	$ 0	$ 0