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Business Combination (Detail) $ / shares in Units, $ in Thousands		9 Months Ended
	Jul. 20, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)
Schedule Of Reverse Recapitalization [Line Items]
Aggregate value of consideration paid to Members in Business Combination | $	$ 806,517
Payments For reverse recapitalization | $	91,646	$ 91,646	$ 0
Direct and incremental costs incurred in connection with the business combination | $	30,551
Business combination costs recorded as reduction of additional-paid in capital | $	$ 21,591	$ (78,468)	$ 0
Percent of tax benefits with provided payment	0.90
Deferred tax asset recognized in business combination | $	$ 24,303
Class A Common Stock
Schedule Of Reverse Recapitalization [Line Items]
Reverse recapitalization (in shares)	12,977,690
Common stock, par or stated value per share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares, issued (in shares)	12,977,690	13,464,542
Common stock, shares, outstanding (in shares)	12,977,690	13,464,542
Conversion of stock (in shares)	3,443,750
Unit conversion (in shares)	486,852
Class B Common Stock
Schedule Of Reverse Recapitalization [Line Items]
Common stock, par or stated value per share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares, issued (in shares)		0
Common stock, shares, outstanding (in shares)		0
Class V Voting Stock
Schedule Of Reverse Recapitalization [Line Items]
Reverse recapitalization (in shares)	96,987,093
Common stock, par or stated value per share (in dollars per share) | $ / shares		$ 0.0001
Stock issued to shareholders (in shares)	96,987,093
Common stock, shares, issued (in shares)		96,500,241
Common stock, shares, outstanding (in shares)		96,500,241
Stock subject to restrictions (in shares)	25,500,000
Earnout Units
Schedule Of Reverse Recapitalization [Line Items]
Stock subject to restrictions (in shares)	25,500,000
Existing Equity Holders
Schedule Of Reverse Recapitalization [Line Items]
Ownership interest retained		87.80%

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