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Fair Value Measurement (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets:    
Foreign exchange contracts $ 65 $ 216
Total assets 80,568 69,559
Liabilities:    
Foreign exchange contracts 6 112
Total liabilities 6 112
Foreign government bond
    
Assets:    
Marketable securities   575
Corporate bonds
    
Assets:    
Marketable securities 80,503 66,809
Certificates of Deposit
    
Assets:    
Marketable securities   1,959
Level I
    
Assets:    
Foreign exchange contracts      
Total assets      
Liabilities:    
Foreign exchange contracts      
Total liabilities      
Level I | Foreign government bond
    
Assets:    
Marketable securities     
Level I | Corporate bonds
    
Assets:    
Marketable securities      
Level I | Certificates of Deposit
    
Assets:    
Marketable securities     
Level II
    
Assets:    
Foreign exchange contracts 65 216
Total assets 80,568 69,559
Liabilities:    
Foreign exchange contracts 6 112
Total liabilities 6 112
Level II | Foreign government bond
    
Assets:    
Marketable securities   575
Level II | Corporate bonds
    
Assets:    
Marketable securities 80,503 66,809
Level II | Certificates of Deposit
    
Assets:    
Marketable securities   1,959
Level III
    
Assets:    
Foreign exchange contracts      
Total assets      
Liabilities:    
Foreign exchange contracts      
Total liabilities      
Level III | Foreign government bond
    
Assets:    
Marketable securities     
Level III | Corporate bonds
    
Assets:    
Marketable securities      
Level III | Certificates of Deposit
    
Assets:    
Marketable securities