Stock Incentive Plans - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Modifications to the performance-based RSUs		(i) the extension of the performance period by one year, (ii) a change to the performance criteria, (iii) a change to the number of units to be issued depending on performance and (iv) for certain grants, imposing a maximum number of units to be issued depending on performance equal to 100% of the target.The modification to the performance-based RSUs subject to a market condition resulted in incremental stock-based compensation expense of $67.0 million, which is being recognized ratably over the modified performance periods.
Percentage of number of units to be issued depending on performance		100.00%
Share based compensation by share based arrangement options vested during the period aggregate fair value	$ 2.1
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	26,171,215
Share based compensation by share based arrangement unrecognised compensation for options unvested	$ 53.5
Share based compensation by share based arrangement unrecognised compensation for options unvested remaining period for recognition	1 year 2 months 12 days
Ccc2021 Employee Stock Purchase Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares sold under plan	608,891
Cayman Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	761,743
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	2,373,542	1,735,900
Employee Tax Obligations [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vested	4,972,134
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted	10,371,334
Vested	14,007,032
Incremental stock-based compensation expense		$ 67.0
Restricted Stock Units (RSUs) [Member] \| Time Based Vesting Requirements [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted	8,099,251
Restricted Stock Units (RSUs) [Member] \| Performance Based Vesting Requirements [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted	2,272,083
Common Class B [Member] \| Performance And Market Based Vesting Conditions [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based compensation by share based arrangement unrecognised compensation for options unvested remaining period for recognition	2 years 7 months 6 days
Common Class B [Member] \| Time Based Vesting [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based compensation by share based arrangement unrecognised compensation for options unvested	$ 185.3

Percentage of number of units to be issued depending on performance.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Description of modification of award under share-based payment arrangement. Includes, but is not limited to, terms for expiration date, vesting rights and exercise price.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Number of shares issued under share-based payment arrangement.

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