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Acquisitions - Additional Information (Detail) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($) vote	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2024	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired				$ 18.9	$ (0.7)
Total contingent consideration	$ 26.6	$ 26.9	$ 18.8	26.6	18.8			$ 20.9	$ 17.6	$ 14.0
Goodwill	234.1			234.1				$ 209.8
Contingent liabilities undiscounted maximum payment	39.7			39.7
Future consideration to be paid to the acquirees	2.6			2.6
Compensation expenses, future services	0.0		$ 0.1	0.0	$ 2.1
Residential Real Estate Brokerages, Title Insurance And Escrow Settlement Services Company
Business Acquisition [Line Items]
Equity interest issued or issuable				26.1
Payment to acquire business, net of cash acquired				21.3
Deferred cash payment	2.7			2.7
Total contingent consideration	7.1			7.1
Recognized identifiable assets and liabilities assumed, other assets	20.1			20.1
Recognized identifiable assets and liabilities assumed, other liabilities	18.9			18.9
Goodwill	24.9			24.9
Goodwill, expected tax deductible amount	$ 9.8			$ 9.8
Residential Real Estate Brokerages, Title Insurance And Escrow Settlement Services Company | Minimum
Business Acquisition [Line Items]
Useful life (in years)	5 years			5 years
Residential Real Estate Brokerages, Title Insurance And Escrow Settlement Services Company | Maximum
Business Acquisition [Line Items]
Useful life (in years)	6 years			6 years
Residential Real Estate Brokerages, Title Insurance And Escrow Settlement Services Company | Forecast
Business Acquisition [Line Items]
Goodwill, expected tax deductible amount						$ 17.0
Residential Real Estate Brokerages, Title Insurance And Escrow Settlement Services Company | Customer Relationships
Business Acquisition [Line Items]
Recognized identifiable assets and liabilities assumed, intangible assets, other than goodwill	$ 28.7			$ 28.7
Residential Real Estate Brokerages, Title Insurance And Escrow Settlement Services Company | Trademarks
Business Acquisition [Line Items]
Recognized identifiable assets and liabilities assumed, intangible assets, other than goodwill	$ 2.4			$ 2.4
Residential Real Estate Brokerages
Business Acquisition [Line Items]
Number of businesses acquired | vote		2
Title Insurance And Escrow Settlement Services Company
Business Acquisition [Line Items]
Ownership interest acquired (in percent)							100.00%
Latter & Blum Holdings, LLC
Business Acquisition [Line Items]
Ownership interest acquired (in percent)		100.00%
Parks Village Nashville, LLC
Business Acquisition [Line Items]
Ownership interest acquired (in percent)		100.00%

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