Strategic Restructuring - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Position	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense incurred			$ 7,756
Restructuring expense including impairment charges			300
Restructuring plan, completion date	Mar. 31, 2015
Restructuring plan, percentage of number of positions eliminated	66.67%
Restructuring plan, number of positions eliminated | Position	40
Stock-based compensation	$ 1,132	$ 2,808	$ 3,940
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense incurred	3,560	$ 0
Stock-based compensation	$ 100