Contingencies (Detail) - Warranty Liability (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Change in Warranty Liability
Aggregate product warranty liability at beginning of period	$ 596	$ 776
Net aggregate expense related to product warranties	(50)	(10)
Aggregate reductions for payments	(14)	(20)
Aggregate product warranty liability at end of period	$ 532	$ 746