Restructuring Expenses - Activity in Restructuring Liability Accounts (Detail) - 2013 Restructuring [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 2,889
Usage	(599)
Ending Balance	2,290
Relocation, move, transition travel, other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	89
Provision-net	13
Usage	(16)
Ending Balance	86
Lease/rental terminations [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	2,800
Provision-net	(13)
Usage	(583)
Ending Balance	$ 2,204