Restructuring Expenses - Activity in Restructuring Liability Accounts (Detail) (2013 Restructuring [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 3,368
Usage	(255)
Ending Balance	3,113
One-time employee termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	215
Provision-net	(194)
Usage	(21)
Lease/rental terminations [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	3,115
Provision-net	219
Usage	(229)
Ending Balance	3,105
Fixed asset write-offs, transition travel, other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	38
Provision-net	(25)
Usage	(5)
Ending Balance	$ 8