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Stock Transactions and Unit Redemptions - Schedule of Changes in Carrying Amount of Redeemable Partnership Interest (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Temporary Equity    
Balance at beginning of period: $ 21,517 $ 26,170
Income allocation 1,740 5,288
Distributions of income (1,740) (5,355)
Redemptions (1,472) (927)
Issuance and other 0 (3,659)
Balance at end of period $ 20,045 $ 21,517