Strategic Restructuring - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) Position	Sep. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
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
Non cash share based compensation cost	$ 1,180	$ 2,578
Employee Severance
Restructuring Cost and Reserve [Line Items]
Non cash share based compensation cost	$ 100