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Amount of cash inflow from the issuance of equity classified as other.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Price of a single share of a number of saleable stocks of a company.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Stock-Based Compensation - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended		12 Months Ended	15 Months Ended
	Jan. 01, 2022	Feb. 28, 2021	Feb. 28, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available for grant (in shares)	20,457,795
Shares purchased under ESPP plan (in shares)				75,376
Stock based compensation expense				$ 63,800,000	$ 167,500,000
Award vesting rights conditions				The performance-based conditions provide that 25% of the options will vest subject to the achievement of a market price per share of $23.14 of the Company's Class A common stock (the "reference price"). An additional 25% of the options will vest upon the achievement of a market price per share of the Company's Class A common stock at each of 200%, 250% and 300% of the reference price.
Intrinsic value of options				$ 15,900,000	79,800,000
Nonvested stock options (in shares)				1,242,420			1,242,420
Weighted average exercise price of nonvested options (in dollars per share)				$ 6.44			$ 6.44
Percentage of options (in percent)				25.00%
Market price per share (in dollars per share)				$ 7,860,000		$ 9,090,000.00	$ 7,860,000
Shares authorized to be repurchased (in shares)				862,080			862,080
Options early exercised (in shares)				0
Unrecognized stock-based compensation expense				$ 598,400,000			$ 598,400,000
Unrecognized stock-based compensation, period of recognition				3 years
Accrued Expenses And Other Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds received for unvested shares of common stock				$ 2,200,000
Other Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds received for unvested shares of common stock				$ 2,900,000
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per share (in dollars per share)				$ 23.14			$ 23.14
Common Class A \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				200.00%
Common Class A \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				250.00%
Common Class A \| Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				300.00%
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)		29,666,480		24,183,825			24,183,825
2021 Agent Equity Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense				$ 15,200,000		$ 84,800,000	$ 100,000,000
Outstanding stock options \| 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period				10 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock options (in shares)				62,462,633		54,517,930	62,462,633
Award vesting rights conditions				The performance-based vesting conditions provide that 12.5% of the shares subject to the RSU will vest subject to the achievement of a market price per share of $23.14 per share of the Company's Class A common stock. An additional 12.5% of the shares subject to the RSU will vest upon the achievement of a market price per share of the Company's Class A common stock at each of 200%, 250%, 300%, 350%, 400%, 450% and 500% of the reference price.
Percentage of options (in percent)				12.50%
Granted (in shares)				25,945,789
Restricted Stock Units \| Service-based and Performance-based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock options (in shares)				17,223,620			17,223,620
Restricted Stock Units \| Common Class A \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				200.00%
Restricted Stock Units \| Common Class A \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				250.00%
Restricted Stock Units \| Common Class A \| Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				300.00%
Restricted Stock Units \| Common Class A \| Share-based Payment Arrangement, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				350.00%
Restricted Stock Units \| Common Class A \| Share-based Payment Arrangement, Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				400.00%
Restricted Stock Units \| Common Class A \| Share-based Payment Arrangement, Tranche Six
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				450.00%
Restricted Stock Units \| Common Class A \| Share-based Payment Arrangement, Tranche Seven
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)				500.00%
Restricted Stock Units \| 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period				7 years
Restricted Stock Units \| 2021 Agent Equity Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation share-based arrangements, liability						$ 100,000,000
Restricted Stock Units \| 2021 Agent Equity Program \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			13,608,896
Restricted Stock Units \| 2022 Agent Equity Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation share-based arrangements, liability				$ 1,300,000			$ 1,300,000
Shares subject to the employee stock purchase plan \| 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of ESPP shares authorized (in shares)		7,416,620
Increase in the shares authorized for issuance as a percentage of shares outstanding (in percent)		1.00%
Number of additional ESPP shares authorized (in shares)	3,918,007
Purchase period		6 years
Purchase price of common stock, percent of market price (in percent)		85.00%
Shares purchased under ESPP plan (in shares)				0
Stock based compensation expense				$ 400,000
Employee withholdings for future purchases under the ESPP				$ 1,300,000			$ 1,300,000
Shares subject to the employee stock purchase plan \| 2021 Employee Stock Purchase Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee subscription amount		$ 12,500
Shares subject to the employee stock purchase plan \| 2021 Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of ESPP shares authorized (in shares)		150,000,000
IPO Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense					$ 148,500,000