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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

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