Restructuring - Reconciliation of Beginning and Ending Liability Balances by Expense Type (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	$ 515
Severance Expense [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance-January 1, 2013
Costs charged to expense	419
Costs paid or otherwise settled	(387)
Ending Balance-December 31, 2013	32
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance-January 1, 2013
Costs charged to expense	96
Costs paid or otherwise settled	(96)
Ending Balance-December 31, 2013