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Warranty Obligations - Changes in Warranty Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Payables And Accruals [Abstract]  
Beginning Balance $ 2,256
Provisions for warranties during the period 1,265
Fulfillment of warranty obligations (990)
Foreign exchange rate changes (24)
Ending Balance $ 2,507