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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, 2019
Dec. 31, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance at beginning of period $ 26,170 $ 21,096
Income allocation 5,288 6,779
Distributions of income (5,355) (2,843)
Redemptions (927) (1,101)
Issuance and other (3,659)  
Issuance and other   2,239
Balance at end of period $ 21,517 $ 26,170