Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) state	Sep. 30, 2021 USD ($) state	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) state item	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reinsurer | item				1
Percentage of insurance subsidiary's total insurance receivables	11.00%	11.00%		11.00%
Minimum cash balance required by lender						$ 3,000
Indemnification hold back cost				$ 2,000
Restricted funds held for payment of possible warranty claims	$ 2,800	$ 2,800		$ 2,800
Number of states regulatory guidelines of warranty claims | state	16	16		16
Customer deposits	$ 500	$ 500		$ 500
Term of American home protect warranty contracts	3 years
Number of states in which home warranty policies are provided | state	45	45		45
Number of additional states | state	4	4		4
Loan proceeds related to the Paycheck Protection Program Loan						8,400
Allowance for uncollectible receivables	$ 367	$ 367		$ 367		$ 249
Deferred policy acquisition costs	3,700	3,700		3,700
Income tax (benefit) expense		$ (1,836)	$ 9	$ (9,917)	$ 33
Effective income tax rate		26.50%	(0.10%)	10.30%	(0.10%)
U.S. federal statutory tax rate				21.00%
Convertible senior notes, due 2026
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal Amount of debt	$ 425,000	$ 425,000		$ 425,000
Interest rate (stated)	0.75%	0.75%		0.75%
Other Noncurrent Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Indemnification hold back cost				$ 1,000
ASU 2016 02 | Impacts of adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use asset	$ 4,000	$ 4,000		4,000
Lease liabilities	$ 4,000	$ 4,000		$ 4,000