Stock-based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 28, 2021 USD ($) $ / shares	Feb. 28, 2021 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) tranche acquisition $ / shares shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 shares	Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares) | shares			177,661,000					148,863,000
Share based payment arrangement, unvested award options, cost not yet recognized, amount | $			$ 142,400
Share based compensation by share based payment arrangement options granted (in shares) | shares			0
Allocated share based compensation | $			$ 112,295	$ 50,744
Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value					110.00%
Percentage of voting stock eligible for options					10.00%
Two Thousand and Twenty Equity Incentive Plan | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares) | shares					60,000,000
Two Thousand and Twenty Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period, employee stock purchase plan			24 months
Allocated share based compensation | $			$ 4,600	500
Two Thousand and Twenty Employee Stock Purchase Plan | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value			85.00%
Common stock shares reserved for future issuance (in shares) | shares					6,000,000
Offering period, employee stock purchase plan			24 months
Number of purchase periods, employee stock purchase plan | acquisition			4,000
Purchase period, employee stock purchase plan			6 months
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares) | shares			58,685,000					63,267,000
Share based payment arrangement, unvested award, period for recognition			2 years 3 months 18 days
Options | Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement number of shares available for issuance (in shares) | shares			0
Options | Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of voting stock eligible for options						10.00%
Share based compensation by share based payment arrangement number of shares available for issuance (in shares) | shares			0
RSUs outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares) | shares			14,489,000					14,684,000
Share based payment arrangement, unvested award, period for recognition			3 years 3 months 18 days
Unrecognized compensation, equity instruments other than options | $			$ 926,600
Allocated share based compensation | $				21,300
Service period			4 years
Grant date fair value (in dollars per share) | $ / shares			$ 66.13					$ 68.03
RSUs outstanding | Founder and CEO Long Term Performance Award | Founder CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation, equity instruments other than options | $	$ 232,200	$ 232,200	$ 178,100
Allocated share based compensation | $			$ 12,000	$ 5,200
Share based compensation by share based payment arrangement maximum number of shares per employee (in shares) | shares		11,500,000
Share-based compensation arrangement by share-based payment award, beginning of award performance period, period after effective date		2 years
Share-based compensation arrangement by share-based payment award, number of tranches | tranche			7
Number of consecutive trading days for the stock hurdle price to be achieved		90 days
Share price (in dollars per share) | $ / shares	$ 165.00	$ 165.00
Grant date fair value (in dollars per share) | $ / shares	$ 20.19	$ 20.19
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangement, unvested award, period for recognition			2 years 1 month 6 days
Unrecognized compensation, equity instruments other than options | $			$ 12,000
Grant date fair value (in dollars per share) | $ / shares			$ 58.80					$ 57.37
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term			24 months
Plan modification, incremental cost | $			$ 4,700
Minimum | Options | Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value							85.00%
Minimum | RSUs outstanding | Founder and CEO Long Term Performance Award | Founder CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangement, unvested award, period for recognition	3 years 5 months 12 days
Maximum | Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term					10 years
Maximum | Options | Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term							10 years
Maximum | Options | Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term						10 years
Maximum | RSUs outstanding | Founder and CEO Long Term Performance Award | Founder CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangement, unvested award, period for recognition	5 years 4 months 17 days
Holders of Ten Percent or More of The Voting Equity Capital | Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term					5 years
Holders of Ten Percent or More of The Voting Equity Capital | Options | Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of voting stock eligible for options							10.00%
Share based compensation by share based payment arrangement contractual term							5 years
Holders of Ten Percent or More of The Voting Equity Capital | Options | Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term						5 years
Holders of Ten Percent or More of The Voting Equity Capital | Minimum | Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value					100.00%
Holders of Ten Percent or More of The Voting Equity Capital | Minimum | Options | Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value							110.00%
Holders of Ten Percent or More of The Voting Equity Capital | Minimum | Options | Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value						110.00%