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Business Combinations - Additional Information (Detail)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended 144 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Entity
Dec. 31, 2012
USD ($)
Entity
Dec. 31, 2011
USD ($)
Entity
Dec. 31, 2013
USD ($)
Entity
Dec. 31, 2013
Brokerage [Member]
USD ($)
Dec. 31, 2013
Risk Management [Member]
USD ($)
Dec. 31, 2013
Giles Group of Companies (GGC) [Member]
USD ($)
Employee
Office
Dec. 31, 2013
Giles Group of Companies (GGC) [Member]
GBP (£)
Dec. 31, 2013
2013 Acquisitions [Member]
USD ($)
Dec. 31, 2013
2013 Acquisitions [Member]
Brokerage [Member]
USD ($)
Dec. 31, 2013
2013 Acquisitions [Member]
Brokerage [Member]
Trade Names [Member]
USD ($)
Dec. 31, 2013
2013 Acquisitions [Member]
Brokerage [Member]
Expiration Lists [Member]
USD ($)
Dec. 31, 2013
2013 Acquisitions [Member]
Brokerage [Member]
Non-Compete Agreements [Member]
USD ($)
Dec. 31, 2013
2013 Acquisitions [Member]
Minimum [Member]
Market Approach Valuation Technique [Member]
Dec. 31, 2013
2013 Acquisitions [Member]
Maximum [Member]
Market Approach Valuation Technique [Member]
Dec. 31, 2013
2012 Acquisitions [Member]
Minimum [Member]
Income Approach Valuation Technique [Member]
Dec. 31, 2013
2012 Acquisitions [Member]
Maximum [Member]
Income Approach Valuation Technique [Member]
Dec. 31, 2012
Acquisitions Made Prior to 2009 [Member]
USD ($)
Entity
Dec. 31, 2011
Acquisitions Made Prior to 2009 [Member]
USD ($)
Entity
Business Acquisition [Line Items]                                      
Cash paid for acquisition of equity interest $ 719.6           $ 387.9 £ 233.0                   $ 3.5 $ 8.2
Number of employees at offices of acquired entity             1,100 1,100                      
Number of offices in which acquiree entity operates             43 43                      
Unrealized fair value, pretax gain             2.6                        
Revenue growth rate                           2.00% 12.00% 2.00% 10.00%    
Discount rate                           8.00% 9.00% 10.50% 14.50%    
Accretion of the discount on acquisition 11.9 9.3 8.3                                
Income related to net adjustments 10.2 5.9 14.5                                
Number of companies acquired 79 46 22 279                           5 19
Aggregate amount of maximum earnout obligations related to acquisitions 462.3 384.8                                  
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet 162.7 139.8                                  
Goodwill 665.0     665.0 664.1 0.9 301.5                        
Trade name 1.8     1.8 1.8          1.8                  
Expiration lists 394.2     394.2 392.6 1.6 89.8     394.2                  
Non-compete agreements 7.1     7.1 7.1   3.7     7.1                  
Attrition rate                               5.00% 15.00%    
Business acquisition not deductible for income tax purposes                     1.8 287.7 4.6            
Deferred tax liability                   48.4                  
Goodwill related to nondeductible amortizable intangible assets                   48.4                  
Common stock issued related to acquisition, shares 5,103                                   425 245
Current liabilities related to earnout obligations                                     18.3
Current goodwill related to earnout obligations                                   0.1 30.0
Annualized revenue of business acquisitions during 6 month period ended June 30, 2013                 383.9                    
Total revenues related to 2013 acquisitions in the aggregate 3,461.2 2,903.6             107.4                    
Net earnings $ 286.3 $ 212.9             $ 2.1