Business Combinations and Disposals - Acquisitions (Details) $ in Thousands								3 Months Ended	12 Months Ended
	Oct. 27, 2021 USD ($)	Sep. 09, 2021 USD ($)	May 20, 2021 USD ($)	Apr. 05, 2021 USD ($)	Jan. 12, 2021 USD ($)	Dec. 31, 2020 USD ($) shares	Jul. 23, 2020 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)
Unaudited Pro Forma Consolidated Financial Information
Revenue									$ 215,769	$ 148,771
Net loss									(112,239)	(61,253)
General and administrative
Business Combinations
Acquisition related costs									5,400	200	$ 100
January 12, 2021 Acquisition ("V12 Data")
Business Combinations
Cash paid in business acquisition					$ 20,196
Cash paid in business acquisition, including cash consideration payable					20,300
Total consideration					21,756
Contingent consideration					$ 1,400
Contingent consideration earnout period					2 years
Net assets acquired					$ 21,756
Estimated fair value					$ 1,410
Estimated Useful Life (in years)					7 years 7 months 6 days
Fair value of the intangible assets as of the date of the acquisition
Fair Value					$ 6,440
January 12, 2021 Acquisition ("V12 Data") | General and administrative
Business Combinations
Acquisition related costs					800
April 5, 2021 Acquisition ("HOA")
Business Combinations
Cash paid in business acquisition				$ 84,370
Cash paid in business acquisition, excluding working capital cash paid				84,100
Total consideration				114,828
Issuance of common stock				22,773
Net assets acquired				114,828
Acquisition hold backs				$ 7,700
Consideration transferred, working capital adjustment								$ 300
Estimated Useful Life (in years)				9 years 6 months
Fair value of the intangible assets as of the date of the acquisition
Fair Value				$ 41,952
April 5, 2021 Acquisition ("HOA") | General and administrative
Business Combinations
Acquisition related costs				1,900
May 20, 2021 Acquisition ("Rynoh")
Business Combinations
Cash paid in business acquisition			$ 32,302
Total consideration			35,802
Net assets acquired			35,802
Acquisition hold backs			$ 3,500
Estimated Useful Life (in years)			10 years
Fair value of the intangible assets as of the date of the acquisition
Fair Value			$ 16,490
May 20, 2021 Acquisition ("Rynoh") | General and administrative
Business Combinations
Acquisition related costs			200
September 9, 2021 Acquisition ("AHP")
Business Combinations
Cash paid in business acquisition		$ 43,750
Total consideration		46,250
Net assets acquired		46,250
Acquisition hold backs		$ 2,500
Estimated Useful Life (in years)		7 years
Fair value of the intangible assets as of the date of the acquisition
Fair Value		$ 2,742
September 9, 2021 Acquisition ("AHP") | General and administrative
Business Combinations
Acquisition related costs		500
Floify
Business Combinations
Cash paid in business acquisition	$ 75,959
Total consideration	95,399
Issuance of common stock	9,908
Net assets acquired	95,399
Acquisition hold backs	900
Estimated fair value	8,632
Guarantee liability	$ 8,600
Estimated Useful Life (in years)	5 years 7 months 6 days
Fair value of the intangible assets as of the date of the acquisition
Fair Value	$ 41,365
Floify | General and administrative
Business Combinations
Acquisition related costs									400
Other Acquisitions
Business Combinations
Cash paid in business acquisition									27,121	325
Total consideration									32,249	1,370
Issuance of common stock									3,026	358
Net assets acquired						$ 1,370			32,249	1,370
Estimated fair value									327
Acquisition related costs									1,600
Goodwill to be not deductible for income tax purposes									3,500
Goodwill to be deductible for income tax purposes									11,000			$ 200
Total Acquisition
Business Combinations
Cash paid in business acquisition									283,698	8,328
Total consideration									346,284	17,623
Issuance of common stock									35,707	6,859
Contingent consideration						1,749				1,749
Net assets acquired						17,623			346,284	17,623
Estimated fair value									$ 10,369
Number of acquisitions | item									5
Revenue									$ 79,600
Net income									$ 1,800
July 23, 2020 Acquisition
Business Combinations
Cash paid in business acquisition							$ 2,000
Total consideration							3,790
Issuance of common stock							1,790
Net assets acquired							3,790
Goodwill to be deductible for income tax purposes							1,600
iRoofing
Business Combinations
Cash paid in business acquisition						6,003
Total consideration						12,463
Issuance of common stock						4,711
Contingent consideration						1,749				1,749
Net assets acquired						$ 12,463				$ 12,463
Number of shares issued as a part of consideration | shares						300,000
Insurance licenses | April 5, 2021 Acquisition ("HOA")
Fair value of the intangible assets as of the date of the acquisition
Fair Value				4,960
Customer relationships
Business Combinations
Estimated Useful Life (in years)									9 years	5 years
Fair value of the intangible assets as of the date of the acquisition
Estimated Useful Life (in years)									9 years	7 years
Customer relationships | January 12, 2021 Acquisition ("V12 Data")
Fair value of the intangible assets as of the date of the acquisition
Fair Value					$ 1,650
Estimated Useful Life (in years)					10 years
Customer relationships | April 5, 2021 Acquisition ("HOA")
Fair value of the intangible assets as of the date of the acquisition
Fair Value				$ 16,700
Estimated Useful Life (in years)				10 years
Customer relationships | May 20, 2021 Acquisition ("Rynoh")
Fair value of the intangible assets as of the date of the acquisition
Fair Value			$ 12,700
Estimated Useful Life (in years)			10 years
Customer relationships | Floify
Fair value of the intangible assets as of the date of the acquisition
Fair Value	$ 7,000
Estimated Useful Life (in years)	4 years
Customer relationships | Total Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value						$ 3,140				$ 3,140
Customer relationships | July 23, 2020 Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value							740
Customer relationships | iRoofing
Fair value of the intangible assets as of the date of the acquisition
Fair Value						2,400				$ 2,400
Acquired technology
Business Combinations
Estimated Useful Life (in years)									4 years	9 years
Fair value of the intangible assets as of the date of the acquisition
Estimated Useful Life (in years)									5 years	6 years
Acquired technology | January 12, 2021 Acquisition ("V12 Data")
Fair value of the intangible assets as of the date of the acquisition
Fair Value					$ 3,525
Estimated Useful Life (in years)					4 years
Acquired technology | May 20, 2021 Acquisition ("Rynoh")
Fair value of the intangible assets as of the date of the acquisition
Fair Value			$ 2,800
Estimated Useful Life (in years)			7 years
Acquired technology | Floify
Fair value of the intangible assets as of the date of the acquisition
Fair Value	$ 28,300
Estimated Useful Life (in years)	4 years
Acquired technology | Other Acquisitions
Fair value of the intangible assets as of the date of the acquisition
Fair Value						300				$ 300
Acquired technology | Total Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value						4,470				4,470
Acquired technology | July 23, 2020 Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value							470
Acquired technology | iRoofing
Fair value of the intangible assets as of the date of the acquisition
Fair Value						3,700				$ 3,700
Trademarks and tradenames
Business Combinations
Estimated Useful Life (in years)									12 years	13 years
Fair value of the intangible assets as of the date of the acquisition
Estimated Useful Life (in years)									12 years	9 years
Trademarks and tradenames | January 12, 2021 Acquisition ("V12 Data")
Fair value of the intangible assets as of the date of the acquisition
Fair Value					$ 1,225
Estimated Useful Life (in years)					15 years
Trademarks and tradenames | April 5, 2021 Acquisition ("HOA")
Fair value of the intangible assets as of the date of the acquisition
Fair Value				$ 12,200
Estimated Useful Life (in years)				10 years
Trademarks and tradenames | May 20, 2021 Acquisition ("Rynoh")
Fair value of the intangible assets as of the date of the acquisition
Fair Value			$ 900
Estimated Useful Life (in years)			20 years
Trademarks and tradenames | September 9, 2021 Acquisition ("AHP")
Fair value of the intangible assets as of the date of the acquisition
Fair Value		$ 700
Estimated Useful Life (in years)		10 years
Trademarks and tradenames | Floify
Fair value of the intangible assets as of the date of the acquisition
Fair Value	$ 6,025
Estimated Useful Life (in years)	15 years
Trademarks and tradenames | Other Acquisitions
Fair value of the intangible assets as of the date of the acquisition
Fair Value						240				$ 240
Trademarks and tradenames | Total Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value						1,510				1,510
Trademarks and tradenames | July 23, 2020 Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value							670
Trademarks and tradenames | iRoofing
Fair value of the intangible assets as of the date of the acquisition
Fair Value						600				$ 600
Value of business acquired
Business Combinations
Estimated Useful Life (in years)									1 year
Fair value of the intangible assets as of the date of the acquisition
Estimated Useful Life (in years)									1 year
Value of business acquired | April 5, 2021 Acquisition ("HOA")
Fair value of the intangible assets as of the date of the acquisition
Fair Value				$ 400
Estimated Useful Life (in years)				1 year
Renewal rights
Business Combinations
Estimated Useful Life (in years)									8 years
Fair value of the intangible assets as of the date of the acquisition
Estimated Useful Life (in years)									6 years
Renewal rights | April 5, 2021 Acquisition ("HOA")
Fair value of the intangible assets as of the date of the acquisition
Fair Value				$ 7,692
Estimated Useful Life (in years)				8 years
Renewal rights | September 9, 2021 Acquisition ("AHP")
Fair value of the intangible assets as of the date of the acquisition
Fair Value		$ 2,042
Estimated Useful Life (in years)		6 years
Non-competition agreements
Business Combinations
Estimated Useful Life (in years)									2 years	2 years
Fair value of the intangible assets as of the date of the acquisition
Estimated Useful Life (in years)									2 years	2 years
Non-competition agreements | January 12, 2021 Acquisition ("V12 Data")
Fair value of the intangible assets as of the date of the acquisition
Fair Value					$ 40
Estimated Useful Life (in years)					2 years
Non-competition agreements | May 20, 2021 Acquisition ("Rynoh")
Fair value of the intangible assets as of the date of the acquisition
Fair Value			$ 90
Estimated Useful Life (in years)			1 year
Non-competition agreements | Floify
Fair value of the intangible assets as of the date of the acquisition
Fair Value	$ 40
Estimated Useful Life (in years)	3 years
Non-competition agreements | Total Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value						225				$ 225
Non-competition agreements | July 23, 2020 Acquisition
Fair value of the intangible assets as of the date of the acquisition
Fair Value							$ 70
Non-competition agreements | iRoofing
Fair value of the intangible assets as of the date of the acquisition
Fair Value						$ 155				$ 155