Stock-Based Incentive Plans - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) plan shares	Dec. 31, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of current benefit plans | plan	2
Number of benefit plans | plan	9
Number of expired benefit plans | plan	7
Restricted Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares, vesting period (in years)	3 years
Number of shares of restricted class A common stock outstanding (in shares)	1,826,571	1,883,784
Unrecognized compensation cost relating to nonvested share-based compensation | $	$ 46.3
Unrecognized compensation cost expected to be recognized over weighted average period (in years)	1 year 1 month 6 days
Expired Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available under plan (in shares)	0
Vest in 2023 | Restricted Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of restricted class A common stock outstanding (in shares)	547,626
Vest in 2024 | Restricted Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of restricted class A common stock outstanding (in shares)	851,201
Vest in 2025 | Restricted Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of restricted class A common stock outstanding (in shares)	427,744
Class A Common Stock | Stock Incentive Current Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares available under plan (in shares)	10,400,000
Number of shares available under plan (in shares)	8,671,307