Stock-based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Feb. 28, 2021 USD ($) tranche $ / shares	Feb. 28, 2021 USD ($) tranche $ / shares shares	Sep. 30, 2022 USD ($) acquisition period tranche $ / shares shares	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) acquisition period tranche $ / shares shares	Sep. 30, 2021 USD ($)	Dec. 31, 2020 shares	Dec. 31, 2017	Dec. 31, 2004	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			169,795,000				169,795,000					148,863,000
Share based payment arrangement, unvested award options, cost not yet recognized, amount			$ 103,200				$ 103,200
Share based compensation by share based payment arrangement options granted (in shares) | shares			0				0
Allocated share based compensation			$ 161,359		$ 89,319		$ 420,042	$ 221,722
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]
Allocated share based compensation			$ 6,800		3,100		$ 17,800	6,500
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				4,000
Purchase period, employee stock purchase plan							6 months
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
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 | 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%
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares) | shares			53,412,000				53,412,000					63,267,000
Share based payment arrangement, unvested award, period for recognition							1 year 10 months 24 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				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				0
Options | Minimum | 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%
Options | Maximum | 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
Options | Maximum | 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
Options | Holders of Ten Percent or More of The Voting Equity Capital | 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
Options | Holders of Ten Percent or More of The Voting Equity Capital | 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
Options | Holders of Ten Percent or More of The Voting Equity Capital | Minimum | 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%
Options | Holders of Ten Percent or More of The Voting Equity Capital | Minimum | 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%
RSUs outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares) | shares			30,731,000				30,731,000					14,684,000
Share based payment arrangement, unvested award, period for recognition							3 years 2 months 12 days
Unrecognized compensation, equity instruments other than options			$ 1,485,900				$ 1,485,900
Allocated share based compensation						$ 21,300
Service period							4 years
Grant date fair value (in dollars per share) | $ / shares			$ 50.09				$ 50.09					$ 68.03
Granted, weighted average grant date fair value (in dollars per share) | $ / shares							$ 41.83
RSUs outstanding | 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	$ 153,600				$ 153,600
Allocated share based compensation			$ 12,300		$ 12,300		$ 36,500	$ 29,700
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				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
Share-based payment arrangement, number of tranches | tranche	7	7
RSUs outstanding | Minimum | 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
RSUs outstanding | Maximum | 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
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
Unrecognized compensation, equity instruments other than options			$ 13,800				$ 13,800
Grant date fair value (in dollars per share) | $ / shares			$ 51.33				$ 51.33					$ 57.37
Granted, weighted average grant date fair value (in dollars per share) | $ / shares							$ 45.99
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	24 months
Plan modification, incremental cost			$ 5,100	$ 4,700
Performance-Based Restricted Stock Units (RSUs) | 2022 PSU Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation, equity instruments other than options			7,000				$ 7,000
Allocated share based compensation			$ 1,000				$ 2,000
PSU target number of shares (in shares) | shares			207,284				207,284
Performance stock units, performance period			3 years
Granted, weighted average grant date fair value (in dollars per share) | $ / shares			$ 43.13
Estimated total share-based payment expense			$ 8,900				$ 8,900
Share-based payment award, number of measurement periods | period			5				5
Performance-Based Restricted Stock Units (RSUs) | Minimum | 2022 PSU Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned of the target number of shares			0.00%				0.00%
Performance-Based Restricted Stock Units (RSUs) | Maximum | 2022 PSU Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned of the target number of shares			200.00%				200.00%