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Fair Value - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair Value Of Financial Instruments [Line Items]        
Contingent consideration at fair value $ 17.2 $ 17.5 $ 10.5 $ 9.0
Minority Interest Ownership Percentage By Noncontrolling Owners 3300.00%      
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 14.9      
Amba [Member]
       
Fair Value Of Financial Instruments [Line Items]        
Contingent payment $ 4.3