Restructuring Expenses - Activity in Restructuring Liability Accounts (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
2012 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 4
Provision-net	(4)
Ending Balance	0
2012 Restructuring [Member] | One-time employee termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	4
Provision-net	(4)
Ending Balance	0
2014 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Provision-net	1,843
Usage	(1,663)
Ending Balance	180
2014 Restructuring [Member] | One-time employee termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Provision-net	1,741
Usage	(1,654)
Ending Balance	87
2014 Restructuring [Member] | Fixed asset write-offs, transition travel, other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Provision-net	102
Usage	(9)
Ending Balance	93
2013 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	3,368
Provision-net	597
Usage	(720)
Ending Balance	3,245
2013 Restructuring [Member] | One-time employee termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	215
Provision-net	(194)
Usage	(21)
Ending Balance	0
2013 Restructuring [Member] | Lease/rental terminations [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	3,115
Provision-net	788
Usage	(658)
Ending Balance	3,245
2013 Restructuring [Member] | Fixed asset write-offs, transition travel, other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	38
Provision-net	3
Usage	(41)
Ending Balance	$ 0