Business Combinations - Fair value of intangible assets (Details) - USD ($) $ in Thousands					9 Months Ended
	Sep. 09, 2021	May 20, 2021	Apr. 05, 2021	Jan. 12, 2021	Sep. 30, 2021
January 12, 2021 Acquisition ("V12 Data")
Business Acquisition [Line Items]
Estimated Useful Life (in years)				7 years 7 months 6 days
Fair Value				$ 6,440
April 5, 2021 Acquisition ("HOA")
Business Acquisition [Line Items]
Estimated Useful Life (in years)			9 years 6 months
Intangible assets, finite-lived			$ 41,952
Insurance Licenses			$ 4,960
May 20, 2021 Acquisition ("Rynoh")
Business Acquisition [Line Items]
Estimated Useful Life (in years)		10 years
Intangible assets, finite-lived		$ 16,590
September 9, 2021 Acquisition ("AHP")
Business Acquisition [Line Items]
Estimated Useful Life (in years)	7 years
Intangible assets, finite-lived	$ 2,742
Customer relationships
Business Acquisition [Line Items]
Estimated Useful Life (in years)					10 years
Customer relationships | January 12, 2021 Acquisition ("V12 Data")
Business Acquisition [Line Items]
Intangible assets, finite-lived				1,650
Fair Value				1,650
Customer relationships | April 5, 2021 Acquisition ("HOA")
Business Acquisition [Line Items]
Estimated Useful Life (in years)			10 years
Intangible assets, finite-lived			$ 16,700
Customer relationships | May 20, 2021 Acquisition ("Rynoh")
Business Acquisition [Line Items]
Estimated Useful Life (in years)		10 years
Intangible assets, finite-lived		$ 12,700
Customer relationships | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 8,900
Customer relationships | Total Acquisition
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 39,950
Acquired technology
Business Acquisition [Line Items]
Estimated Useful Life (in years)					5 years
Acquired technology | January 12, 2021 Acquisition ("V12 Data")
Business Acquisition [Line Items]
Intangible assets, finite-lived				3,525
Fair Value				3,525
Acquired technology | May 20, 2021 Acquisition ("Rynoh")
Business Acquisition [Line Items]
Estimated Useful Life (in years)		7 years
Intangible assets, finite-lived		$ 2,900
Acquired technology | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 970
Acquired technology | Total Acquisition
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 7,395
Trademarks and tradenames
Business Acquisition [Line Items]
Estimated Useful Life (in years)					11 years
Trademarks and tradenames | January 12, 2021 Acquisition ("V12 Data")
Business Acquisition [Line Items]
Intangible assets, finite-lived				1,225
Fair Value				1,225
Trademarks and tradenames | April 5, 2021 Acquisition ("HOA")
Business Acquisition [Line Items]
Estimated Useful Life (in years)			10 years
Intangible assets, finite-lived			$ 12,200
Trademarks and tradenames | May 20, 2021 Acquisition ("Rynoh")
Business Acquisition [Line Items]
Estimated Useful Life (in years)		20 years
Intangible assets, finite-lived		$ 900
Trademarks and tradenames | September 9, 2021 Acquisition ("AHP")
Business Acquisition [Line Items]
Estimated Useful Life (in years)	10 years
Intangible assets, finite-lived	$ 700
Trademarks and tradenames | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 5,160
Trademarks and tradenames | Total Acquisition
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 20,185
Non-competition agreements
Business Acquisition [Line Items]
Estimated Useful Life (in years)					2 years
Non-competition agreements | January 12, 2021 Acquisition ("V12 Data")
Business Acquisition [Line Items]
Intangible assets, finite-lived				40
Fair Value				$ 40
Non-competition agreements | May 20, 2021 Acquisition ("Rynoh")
Business Acquisition [Line Items]
Estimated Useful Life (in years)		1 year
Intangible assets, finite-lived		$ 90
Non-competition agreements | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 55
Non-competition agreements | Total Acquisition
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 185
Value of business acquired
Business Acquisition [Line Items]
Estimated Useful Life (in years)					1 year
Value of business acquired | April 5, 2021 Acquisition ("HOA")
Business Acquisition [Line Items]
Estimated Useful Life (in years)			1 year
Intangible assets, finite-lived			$ 400
Value of business acquired | Total Acquisition
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 400
Renewal rights
Business Acquisition [Line Items]
Estimated Useful Life (in years)					8 years
Renewal rights | April 5, 2021 Acquisition ("HOA")
Business Acquisition [Line Items]
Estimated Useful Life (in years)			8 years
Intangible assets, finite-lived			$ 7,692
Renewal rights | September 9, 2021 Acquisition ("AHP")
Business Acquisition [Line Items]
Estimated Useful Life (in years)	6 years
Intangible assets, finite-lived	$ 2,042
Renewal rights | Total Acquisition
Business Acquisition [Line Items]
Intangible assets, finite-lived					$ 9,734
Insurance licenses | April 5, 2021 Acquisition ("HOA")
Business Acquisition [Line Items]
Insurance Licenses			$ 4,960
Insurance licenses | Total Acquisition
Business Acquisition [Line Items]
Insurance Licenses					$ 4,960