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Equity and Redeemable Non-controlling Interest - Summary of Non-controlling Interest Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Redeemable Non-controlling Interest [Abstract]    
December 31, 2018 $ 9,233  
Settlement of 2018 performance participation allocation 37,484 $ 16,974
Conversion to Class I shares (11,620) (1,036)
Repurchases (4,314)  
GAAP income allocation (277) $ (347)
Distributions (451)  
Fair value allocation 1,080  
March 31, 2019 $ 31,135