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Stock Transactions and Unit Redemptions - Summary of Changes in Carrying Amount of FPUs (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Stock Transactions Parenthetical Disclosures [Abstract]    
Balance at beginning of period $ 23,638 $ 24,706
Consolidated net income allocated to FPUs 815 1,942
Earnings distributions (255) (1,297)
FPUs exchanged (797) (733)
FPUs redeemed (121) (58)
Balance at end of period $ 23,280 $ 24,560