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Business Combinations - Additional Information (Detail)
$ in Millions
 3 Months Ended 267 Months Ended
Mar. 31, 2024
USD ($)
Entity
Mar. 31, 2023
USD ($)
Entity
Mar. 31, 2024
USD ($)
Entity
Business Acquisition [Line Items]      
Accretion of the discount on acquisition $ 18.8 $ 19.8  
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations $ 34.9 $ (22.0)  
Number of companies acquired | Entity 37 22 713
Aggregate amount of maximum earnout obligations related to acquisitions $ 1,935.9    
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet 1,240.5    
Aggregate amount of earnout obligation expected settlement in cash or stock at option 503.0   $ 503.0
Aggregate amount of earnout obligation expected settlement in cash 737.5   737.5
Goodwill 187.3   187.3
Expiration lists 181.4   181.4
Non-compete agreements 4.4   4.4
Write-off of amortizable intangible assets 0.0 $ 0.1  
Total revenues 3,257.9 $ 2,727.5  
Brokerage Management [Member]      
Business Acquisition [Line Items]      
Goodwill 187.3   187.3
Expiration lists 181.4   181.4
Non-compete agreements 4.4   4.4
Brokerage [Member] | Expiration Lists [Member]      
Business Acquisition [Line Items]      
Business acquisition not deductible for income tax purposes 22.7   22.7
Brokerage [Member] | Non-Compete Agreements [Member]      
Business Acquisition [Line Items]      
Business acquisition not deductible for income tax purposes $ 1.6   $ 1.6
Minimum [Member] | Expiration Lists [Member]      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles assets, years 2 years   2 years
Minimum [Member] | Non-Compete Agreements [Member]      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles assets, years 2 years   2 years
Minimum [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles assets, years 2 years   2 years
Maximum [Member] | Expiration Lists [Member]      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles assets, years 15 years   15 years
Maximum [Member] | Non-Compete Agreements [Member]      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles assets, years 6 years   6 years
Maximum [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles assets, years 15 years   15 years
2024 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Measurement input 0.05   0.05
2024 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Measurement input 0.15   0.15
2024 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Discount Rate [Member]      
Business Acquisition [Line Items]      
Measurement input 0.09   0.09
Business Acquisition [Member]      
Business Acquisition [Line Items]      
Annualized revenue of business acquisitions $ 69.2    
Total revenues 12.2    
Net earnings (5.7)    
Net earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earnout payables (1.1)    
Business Acquisition [Member] | Brokerage [Member]      
Business Acquisition [Line Items]      
Expiration lists 181.4   $ 181.4
Trade names 4.4   4.4
Deferred tax liability $ 5.7   $ 5.7