Summary of Restructuring Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	$ 1,591,000
Restructuring costs		1,700,000
Cash payments	(50,000)
Restructuring Reserve, Ending Balance	$ 1,541,000	$ 1,591,000