Product Warranty Costs and Inventory Valuation Reserves - Roll-forward of Warranty Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Movement In Standard And Extended Product Warranty Increase Decrease [Roll Forward]
Accrued product warranty costs, beginning of period	$ 1,113	$ 1,040
Warranty provision	387	2,100
Warranty expenditures	(509)	(2,027)
Accrued product warranty costs, end of period	$ 991	$ 1,113