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Fair Value Measurement (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets:    
Marketable securities $ 48,268 $ 47,833
Foreign exchange contracts 15  
Liabilities:    
Foreign exchange contracts   64
Contingent Consideration   3,603
Certificates of deposits    
Assets:    
Marketable securities 1 1,975
Corporate bonds    
Assets:    
Marketable securities 48,267 45,858
Level II    
Assets:    
Foreign exchange contracts 15  
Liabilities:    
Foreign exchange contracts   64
Level II | Certificates of deposits    
Assets:    
Marketable securities 1 1,975
Level II | Corporate bonds    
Assets:    
Marketable securities $ 48,267 45,858
Level 3    
Liabilities:    
Contingent Consideration   $ 3,603