Summary of Restructuring Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Restructuring Cost And Reserve [Line Items]
Restructuring obligations, December 31, 2013	$ 277
Restructuring costs incurred
Cash payments	(93)
Non-cash settlements and other
Restructuring obligations, March 31, 2014	184
Facilities
Restructuring Cost And Reserve [Line Items]
Restructuring obligations, December 31, 2013	211
Restructuring costs incurred
Cash payments	(27)
Non-cash settlements and other
Restructuring obligations, March 31, 2014	184
Contract Termination
Restructuring Cost And Reserve [Line Items]
Restructuring obligations, December 31, 2013	66
Restructuring costs incurred
Cash payments	(66)
Non-cash settlements and other