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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Acquisition
Dec. 31, 2012
Acquisition
Finite-Lived Intangible Assets [Line Items]    
Additions to goodwill $ 9.3 $ 57.2
Reduction in the value of goodwill 0.7  
Number of acquisitions 2 2
Goodwill purchase price adjustments   1.4
Finite-Lived Intangible Asset, Useful Life 8 years 3 months 18 days  
Minimum [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Maximum [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Client lists [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Remaining weighted average amortization period remaining for total intangible assets 8 years 6 months  
Other intangibles [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 3 years 1 month 6 days  
Other intangibles [Member] | Minimum [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Other intangibles [Member] | Maximum [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Financial Services [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Additions to goodwill 1.4 25.4
Employee Services [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Additions to goodwill $ 7.9 $ 31.8