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Stock Transactions and Unit Redemptions - Summary of Changes in Carrying Amount of FPUs (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock Transactions Parenthetical Disclosures [Abstract]    
Balance at beginning of period $ 20,674 $ 23,638
Consolidated net income allocated to FPUs 520  
FPUs exchanged (256) (181)
FPUs redeemed (949)  
Balance at end of period $ 19,989 $ 23,457