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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
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Class of Stock [Line Items]        
Weighted-average price for redemption of limited partnership units $ 3.05 $ 5.44 $ 3.92 $ 5.96
Repurchase of Class A common stock, shares Treasury Stock Shares Acquired       233,172
Aggregate purchase price of Class A common stock       $ 1,236
Class A Common Stock [Member]        
Class of Stock [Line Items]        
Common stock, shares issued for redemption/cancellation of units 700,000 2,300,000 2,100,000 2,400,000
Common stock, shares issued for exchange of units 1,300,000 1,600,000 1,800,000 2,500,000
Repurchase of Class A common stock, shares Treasury Stock Shares Acquired 0 0 0 233,000
Aggregate purchase price of Class A common stock       $ 1,200
Weighted-average price of Class A common stock       $ 5.30
Limited Partnership [Member]        
Class of Stock [Line Items]        
Redeemed limited partnership units 100,000 100,000 300,000 1,300,000
Aggregate redemption price of limited partnership units $ 300 $ 500 $ 1,300 $ 7,700
Other Ownership Interest [Member]        
Class of Stock [Line Items]        
Redeemed limited partnership units 1,000 2,800 1,000 5,100
Aggregate redemption price of limited partnership units $ 4 $ 16 $ 4 $ 30
Weighted-average price for redemption of founding/working partner units $ 3.07 $ 5.79 $ 3.07 $ 5.94