Restructuring Expenses - Activity in Restructuring Liability Account (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 8
Provision-net
Usage	(4)
Reclass
Ending Balance	4
One-time employee termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	8
Provision-net
Usage
Reclass	(4)
Ending Balance	4
Lease/rental terminations [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Provision-net
Usage
Reclass
Ending Balance
Relocation, move, other expenses [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Provision-net
Usage	(4)
Reclass	4
Ending Balance