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Stock Transactions and Unit Redemptions - Summary of Changes in Carrying Amount of FPUs (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Stock Transactions Parenthetical Disclosures [Abstract]    
Balance at beginning of period $ 23,638 $ 24,706
Consolidated net income allocated to FPUs 255 1,297
Earnings distributions   (721)
FPUs exchanged (470) (343)
FPUs redeemed (80) (10)
Balance at end of period $ 23,343 $ 24,929