Restructuring and Severance (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Restructuring Cost And Reserve [Line Items]
Employee Severance Expense Recorded During Period	$ 437	$ 1,800
Restructuring and Severance
Restructuring Cost And Reserve [Line Items]
Restructuring and Severance Beginning Balance	1,149
Employee Severance Expense Recorded During Period	437	1,770
Payments to Employees	(313)	(621)
Restructuring and Severance Ending Balance	$ 1,273	$ 1,149