Restructuring and Severance Costs (Detail) - Lease Termination Restructuring Accrual (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	$ 484	$ 915
Provision for additional expense	1,525	0
Payments and adjustments	(732)	(431)
Balance at end of period		484
Period End [Member]
Restructuring Cost and Reserve [Line Items]
Balance at end of period	$ 1,277	$ 484