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Other Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule Of Equity Method Investments [Line Items]        
Foreign currency gains (losses) $ 0.1 $ (0.4) $ (0.8) $ (0.2)
Metastorm
       
Schedule Of Equity Method Investments [Line Items]        
Escrowed proceeds received       $ 0.2