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Product Warranties - Product Warranty Activities (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Guarantees [Abstract]    
Beginning of period $ 6,956 $ 8,266
Provision for product warranties 1,589 1,251
Direct charges to warranty liability (1,476) (2,206)
Foreign currency translation 48 (136)
End of period $ 7,117 $ 7,175