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Fair Value - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fair Value Of Financial Instruments [Line Items]        
Contingent consideration at fair value $ 13.3 $ 17.5 $ 12.4 $ 9.0
Minority Interest Ownership Percentage By Noncontrolling Owners 3300.00%      
Available For Sale Equity Securities Amortized Cost Basis 41.20      
Purchase Of Remaining Ownership Interest 11      
Minimum [Member]
       
Fair Value Of Financial Instruments [Line Items]        
Range of Fixed Maturity and Open Ended Mutual Funds 1      
Maximum [Member]
       
Fair Value Of Financial Instruments [Line Items]        
Range of Fixed Maturity and Open Ended Mutual Funds 11      
Other Liabilities
       
Fair Value Of Financial Instruments [Line Items]        
Contingent consideration at fair value 2.3      
Accounts Payable And Accrued Liabilities [Member]
       
Fair Value Of Financial Instruments [Line Items]        
Contingent consideration at fair value $ 11.1