Broker fees amount is paid as a percentage of the total commission on the transaction.

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Represents grandfathered agents as a percent of total agents.

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Represents the number of countries and territories conducted operations by the entity.

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Significant accounting policies line items.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) country	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies [Line Items]
Broker fees, as a percent	1.00%
Grandfathered agents as a percent	16.00%
Impairment of franchise agreements and other intangible assets subject to amortization	$ 0	$ 0	$ 0
Impairment of goodwill	$ 0	$ 0	$ 0
Equity-based compensation vesting period	3 years
Minimum
Significant Accounting Policies [Line Items]
Number of countries and territories operations conducted \| country	110
Software \| Minimum
Significant Accounting Policies [Line Items]
Useful life of intangible assets	2 years
Software \| Maximum
Significant Accounting Policies [Line Items]
Useful life of intangible assets	5 years