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Summary of Movement in Warranty Accrual (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Product Liability Contingency [Line Items]    
Beginning balance $ 1,072 $ 1,443
Warranty accruals 26 19
Settlements and adjustments 86 (247)
Ending balance $ 1,184 $ 1,215