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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2011
Year
Dec. 31, 2010
Dec. 31, 2009
Significant Accounting Policies [Line Items]      
Restricted cash $ 4,026,000    
Foreign currency translation, net   100,000 100,000
Gains (losses) from foreign currency remeasurement 0 600,000 (300,000)
Scanners, Warranty period 1 year    
Advertising cost $ 21,200,000 $ 20,200,000 $ 18,100,000
Property, plant and equipment, minimum estimated useful lives (in years) 3    
Property, plant and equipment, maximum estimated useful lives (in years) 5    
Other intangible assets, estimated useful lives 1    
Other intangible assets, estimated useful lives 15    
Building
     
Significant Accounting Policies [Line Items]      
Property, plant and equipment, maximum estimated useful lives (in years) 20    
Software Development
     
Significant Accounting Policies [Line Items]      
Capitalized software costs, estimated useful lives 3    
Maximum
     
Significant Accounting Policies [Line Items]      
Original maturity of highly liquid investments included in Cash and cash equivalents 3 months