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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2021	Feb. 28, 2021	Mar. 31, 2021	Mar. 31, 2020
Class of Stock [Line Items]
Weighted-average price for redemption of limited partnership units			$ 4.36	$ 4.30
Repurchase of Class A common stock, shares Treasury Stock Shares Acquired	3,000	962,000	965,000
Aggregate purchase price of Class A common stock			$ 4,397
Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued for redemption/cancellation of units			1,600,000	1,400,000
Common stock, shares issued for exchange of units			9,100,000	600,000
Repurchase of Class A common stock, shares Treasury Stock Shares Acquired			964,471	0
Aggregate purchase price of Class A common stock			$ 4,400
Weighted-average price of Class A common stock			$ 4.56
Limited Partnership [Member]
Class of Stock [Line Items]
Redeemed limited partnership units			14,000	200,000
Aggregate redemption price of limited partnership units			$ 61	$ 1,000
Other Ownership Interest [Member]
Class of Stock [Line Items]
Redeemed limited partnership units			6,000	0
Aggregate redemption price of limited partnership units			$ 28
Weighted-average price for redemption of founding/working partner units			$ 4.48

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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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