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Accrued Expenses - Changes in Warranty Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Beginning Balance $ 2,256 $ 2,097
Provisions for warranties issued during the period 2,770 1,725
Fulfillment of warranty obligations (2,114) (1,609)
Foreign exchange rate changes 104 43
Ending Balance $ 3,016 $ 2,256