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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock Table Footnote (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Class of Stock [Line Items]
Weighted-average price for redemption of limited partnership units (in dollars per share)	$ 4.30	$ 4.36
Aggregate purchase price of Class A common stock	$ 0	$ 4,397
Limited Partnership
Class of Stock [Line Items]
Redeemed limited partnership units (in shares)	14	14
Aggregate redemption price of limited partnership units	$ 59	$ 61
FPUs
Class of Stock [Line Items]
Redeemed limited partnership units (in shares)	29	6
Aggregate redemption price of limited partnership units	$ 114	$ 28
Weighted-average price for redemption of founding/working partner units (in dollars per share)	$ 3.88	$ 4.48
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares issued for redemption/cancellation of units (in shares)	3,300	1,600
Common stock, shares issued for exchange of units	3,800	9,100
Stock repurchased during period (in shares)	0	1,000
Aggregate purchase price of Class A common stock		$ 4,400
Weighted-average price of Class A common stock (in dollars per share)		$ 4.56

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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