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Guarantees - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Guarantees [Abstract]    
Expiration dates of guarantees 2020  
Potential maximum exposure under these lease guarantees $ 34.4 $ 39.0
Liability for guarantees representing fair value based on discounted cash-flow analysis $ 0.5 $ 0.7