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Guarantees - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Guarantor Obligations [Line Items]    
Potential maximum exposure under these lease guarantees $ 48.2 $ 24.0
Liability for guarantees representing fair value based on discounted cash-flow analysis $ 1.0 $ 0.5
Minimum
   
Guarantor Obligations [Line Items]    
Expiration dates of guarantees 2013  
Maximum
   
Guarantor Obligations [Line Items]    
Expiration dates of guarantees 2019