Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Additional Information (Detail)

v2.4.0.8
Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Property, Plant and Equipment [Line Items]        
Capital expenditure, additions, during the period $ 38.4 $ 20.7 $ 127.5 $ 55.2
Real Estate [Member]
       
Property, Plant and Equipment [Line Items]        
Capital expenditure, additions, during the period $ 18.8