Restructuring and Severance - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost And Reserve [Line Items]
Restructuring and severance	$ 2,739	$ 172
General and Administrative Expense
Restructuring Cost And Reserve [Line Items]
Severance costs		$ 100