Contingencies (Detail) - Warranty Liability (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Change in Warranty Liability
Aggregate product warranty liability at beginning of period	$ 596	$ 776
Net aggregate expense related to product warranties	(75)	98
Aggregate reductions for payments	(22)	(72)
Aggregate product warranty liability at end of period	$ 499	$ 802