Restructuring Expenses - Activity in Restructuring Liability Accounts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2014	Sep. 30, 2014 2012 Restructuring [Member]	Sep. 30, 2014 2012 Restructuring [Member] One-time employee termination benefits [Member]	Sep. 30, 2014 2014 Restructuring [Member]	Sep. 30, 2014 2014 Restructuring [Member] One-time employee termination benefits [Member]	Sep. 30, 2014 2014 Restructuring [Member] Fixed asset write-offs, transition travel, other [Member]	Sep. 30, 2014 2013 Restructuring [Member]	Sep. 30, 2014 2013 Restructuring [Member] One-time employee termination benefits [Member]	Sep. 30, 2014 2013 Restructuring [Member] Fixed asset write-offs, transition travel, other [Member]	Sep. 30, 2014 2013 Restructuring [Member] Lease/rental terminations [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		$ 4	$ 4				$ 3,368	$ 215	$ 38	$ 3,115
Provision-net		(4)	(4)	1,801	1,697	104	639	(194)	15	818
Usage	(400)			(1,711)	(1,696)	(15)	(1,006)	(21)	(53)	(932)
Ending Balance				$ 90	$ 1	$ 89	$ 3,001			$ 3,001