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Contingencies (Detail) - Warranty Liability (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Change in Warranty Liability    
Aggregate product warranty liability at beginning of period $ 776 $ 313
Net aggregate expense related to product warranties 208 710
Aggregate reductions for payments (89) (240)
Aggregate product warranty liability at end of period $ 895 $ 783