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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended				3 Months Ended		9 Months Ended
	Jun. 30, 2021	Oct. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 21, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)								971,000
Allocated share based compensation expenses						$ 38,074	$ 2,941	$ 86,996	$ 10,652
2021 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	18,946,871			18,946,871
Employee Stock Option Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense total unrecognized						71,400		$ 71,400
Stock-based compensation weighted-average year								2 years 8 months 12 days
Employee Stock Option Member \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense total unrecognized						$ 9,700		$ 9,700
Stock-based compensation weighted-average year								3 years 10 months 24 days
Granted (in shares)				970,970		0
Allocated share based compensation expenses						$ 1,500
Employee Stock Option Member \| Executive Officer \| Time Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares that were modified for vesting conditions, outstanding (in shares)						1,706,888		1,706,888
Employee Stock Option Member \| Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage that was modified						25.00%		25.00%
Employee Stock Option Member \| Executive Officers And Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares that were modified for vesting conditions (in shares)						4,477,218		4,477,218
Employee Stock Option Member \| Executive Officers And Employees \| Performance Shares \| Service Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New fair value								$ 76,600
Modified unrecognized compensation expense						$ 38,700		$ 38,700
Modified unrecognized compensation expense period								2 years 8 months 12 days
Employee Stock Option Member \| Executive Officers And Employees \| Modified Vesting Conditions \| Performance Shares \| Service Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expenses	$ 23,300					$ 14,600		$ 37,900
Employee Stock Option Member \| One Executive Officer \| 2019 Performance Obligaitons
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares that were modified for vesting conditions (in shares)						3,627,936		3,627,936
New fair value								$ 11,400
Employee Stock Option Member \| One Executive Officer \| 2019 Performance Obligaitons \| Service Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expenses	6,600					$ 4,100		10,600
Modified unrecognized compensation expense						8,500		$ 8,500
Modified unrecognized compensation expense period								2 years
Employee Stock Option Member \| Terminated Employees \| Modified Vesting Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expenses				$ 900		$ 500		$ 1,400
Shares that were modified for vesting conditions (in shares)						63,235		63,235
Employee Stock Option Member \| Terminated Employees \| Modified Vesting Conditions \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expenses		$ 1,300
Shares that were modified for vesting conditions (in shares)		51,404
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation weighted-average year								3 years 2 months 12 days
Allocated share based compensation expenses						$ 15,500	$ 800	$ 27,700	3,200
Fair value of vested options								20,000	$ 3,100
Remaining stock-based compensation expense						$ 60,300		$ 60,300
Granted (in shares)								1,978,000
Units vested upon effectiveness of IPO (in shares)						476,646		476,646
Number of shares cancelled in shares buyback program (in shares)			60,405
Restricted stock units \| Liquidity Event Restricted Stock Units \| Time Based Liquidity Event Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expenses						$ 12,100		$ 22,800
Restricted stock units \| Executive Officer \| Liquidity Event Restricted Stock Units \| Time Based Liquidity Event Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified unrecognized compensation expense						26,000		$ 26,000
Modified unrecognized compensation expense period								3 years
Modified vesting conditions of shares outstanding (in shares)								1,725,942
New fair value of units due to remeasurement								$ 43,300
Accelerated compensation expense recognized	7,400					$ 9,900		17,300
Restricted stock units \| Executive Officer \| Service Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation weighted-average year						3 years 10 months 24 days
Allocated share based compensation expenses						$ 1,400
Remaining stock-based compensation expense						$ 9,200		$ 9,200
Granted (in shares)				388,389
Units granted, fair value				$ 10,800
Restricted stock units \| Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					30,434
Percentage of assets sold or transferred for equity instruments other than options to vest					50.00%
Restricted stock units \| Employees \| Liquidity Event Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)								1,338,028
Retainage period								6 years 6 months
Restricted stock units \| Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares that were modified for vesting conditions, outstanding (in shares)						111,902		111,902
Vesting percentage that was modified, RSUs								25.00%
Restricted stock units \| Employees \| Performance Shares \| Service Vesting Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New fair value								$ 2,900
Modified unrecognized compensation expense, RSUs						$ 2,100		$ 2,100
Modified unrecognized compensation expense period, RSUs								3 years 1 month 6 days
Restricted stock units \| Employees \| Modified Vesting Conditions \| Performance Shares \| Service Vesting Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expenses	$ 200					$ 600		$ 900
Restricted stock units \| Maximum \| Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					100.00%
Par value (in dollars per share)					$ 29.46
Restricted stock units \| Minimum \| Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					0.00%
Par value (in dollars per share)					$ 19.64
2000 and 2020 Performance Options Performance Restricted Stock Units and Liquidity Restricted Event Restricted Stock Units \| Median
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Par value (in dollars per share)										$ 25.50
Employee Stock Purchase Plan \| Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	3,552,538			3,552,538