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Business Combinations and Asset Acquisitions - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Acquisitions shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Oct. 09, 2020 USD ($)	Feb. 28, 2019	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Fair value of Contingent consideration liability	$ 24.4	$ 39.8	$ 16.4			$ 19.6
Business Combination Future Compensation To Be Paid To The Acquires	60.5
Business acquistion compensation expenses	$ 28.6	$ 4.2	$ 7.1
Sharebased compensation arrangement, shares of common stock granted to sellers | shares	277,776	221,390	21,080
Business Combinations contingent liabilities undiscounted maximum payment	$ 24.4
Business combination contingent consideration fixed in value	11.0
Business Combination, Consideration Transferred	$ 11.0
2021 Acquisitions
Business Acquisition [Line Items]
Number Of asset Acquisitions | Acquisitions	2
Asset acquisition, Consideration in cash	$ 13.2
Asset acquisition, Consideration in equity interest issued and issuable	5.8
Business combination contingent consideration payable in cash	5.6
Business combination contingent consideration additional payable in cash	3.4
Business acquistion compensation expenses	1.1	$ 0.0	$ 0.6
Business Combination, Consideration Transferred	185.6
2021 Acquisitions | Broker Relationships [Member]
Business Acquisition [Line Items]
Finite lived intangible assets acquired	23.9
Modus Technologies, Inc. | 2020 Acquisitions
Business Acquisition [Line Items]
Business acquistion percentage of voting rights acquired				100.00%
Business Combination, maximum amount of contingent consideration that could be earned				$ 70.0
Business combination contingent consideration payable in cash				50.0
Business combination contingent consideration payable in common stock				20.0
Fair value of Contingent consideration liability				$ 20.0
Business Combination, Consideration Transferred	49.7
Contactually, Inc | 2019 Acquisitions
Business Acquisition [Line Items]
Business acquistion percentage of voting rights acquired					100.00%
Business combination contingent consideration payable in cash	0.0
Business Combination, Consideration Transferred	26.1
Other | 2020 Acquisitions
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	0.9
Other | 2019 Acquisitions
Business Acquisition [Line Items]
Business combination contingent consideration payable in cash	7.4		13.1
Fair value of Contingent consideration liability			$ 7.4
Business combination contingent consideration payable period			6 years
Business Combination, Consideration Transferred	$ 22.0
KVS Title LLC [Member] | 2021 Acquisitions
Business Acquisition [Line Items]
Business acquistion percentage of voting rights acquired	100.00%

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