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This is the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Number of awards earned percentage.

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Stockholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended	9 Months Ended
	Mar. 15, 2020	Sep. 30, 2021	Sep. 30, 2021	Apr. 30, 2018
2018 Share Repurchase Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Repurchase of common stock		0	0
Stock repurchase program, remaining amount		$ 173,800,000	$ 173,800,000
Maximum [Member] \| Class A Common stock [Member] \| 2018 Share Repurchase Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase program, authorized amount				$ 200,000,000.0
Performance Based RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Conversion of stock description			The number of shares earned will range from 0% to 150% of the target number of shares granted, depending on an adjusted operating cash flow metric for the year ended December 31, 2021 relative to pre-established thresholds. Shares earned (if any) based on the level of achievement will vest over a period of four years following the grant date, with 25% vesting on the one year anniversary of the grant date and the remaining quarterly thereafter, subject to continued service by the employees. The target number of shares granted totaled 1.2 million.
Share-based compensation awards vesting period	4 years
Number of shares across all executives totaled	$ 1,200,000
Performance Based RSUs [Member] \| One Year Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights, percentage	25.00%
Performance Based RSUs [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of awards earned percentage	0.00%
Performance Based RSUs [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of awards earned percentage	150.00%