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Description of Business and Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2011
D
Y
segment
W
M
Dec. 31, 2010
Dec. 31, 2009
Description of Business and Significant Accounting Policies        
Number of weeks in each fiscal quarter for 52-week fiscal year   13    
Revenue Recognition        
Revenue retention percentage, minimum   10.00%    
Revenue retention percentage, maximum   20.00%    
Cash and Cash Equivalents        
Maturity period of cash and cash equivalents, maximum (in months)   3    
Short-Term Investments        
Maturity period of short-term investments, minimum (in months)   3    
Goodwill and Indefinite-Lived Intangibles        
Number of reportable segments   2    
Trading days prior to measurement date   10    
Definite-Lived Intangible and Long-Lived Assets        
Minimum estimated useful lives (in years)   2    
Maximum estimated useful lives (in years)   17    
Advertising Expense        
Advertising expenses   $ 1.4 $ 1.3 $ 0.6
Goodwill and Indefinite-Lived Intangibles        
The more-likely-than-not probability threshold must be greater than this percentage (as a percent) 50.00%      
Derivative [Line Items]        
Foreign currency exchange (loss) gain   (1.0) 1.3 (0.7)
Weighted average notional amount of derivative contracts   10.3    
Forward Contracts [Member]
        
Derivative [Line Items]        
Foreign currency exchange (loss) gain   0.5 0.1 0.1
Prepaid expenses and other current assets     0.3  
Notional amount of monthly forward contracts   $ 3.6