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Other Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite And Infinite Lived Intangible Assets [Line Items]      
Amortization expense $ 57.0 $ 17.5 $ 8.2
Estimated future amortization expense, 2014 103.6    
Estimated future amortization expense, 2015 73.6    
Estimated future amortization expense, 2016 53.8    
Estimated future amortization expense, 2017 42.4    
Estimated future amortization expense, 2018 28.8    
Purchase Price Allocation Adjustments [Member]
      
Finite And Infinite Lived Intangible Assets [Line Items]      
Recorded out-of-period adjustment attributable to purchase price allocation   1.5  
Amount by which other assets increased   $ 4.4