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Profit on Disposal, Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]        
Profit on disposal, net   $ 0 $ 0.1 $ 0
United Kingdom Real Estate [Member]
       
Property, Plant and Equipment [Line Items]        
Profit on disposal, net $ 0.1 $ 0 $ 0.1 $ 0