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Equity and Redeemable Non-controlling Interest - Summary of Non-controlling Interest Activity Related to Special Limited Partner (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 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) 0
GAAP income allocation $ (732) $ (164) (1,083) $ (786)
September 30, 2019 8,996   8,996  
Special Limited Partner [Member]        
Redeemable Non-controlling Interest [Abstract]        
December 31, 2018     9,233  
Settlement of 2018 performance participation allocation     37,484  
Conversion to Class I shares     (11,620)  
Repurchases     (35,435)  
GAAP income allocation     (403)  
Distributions     (649)  
Fair value allocation     1,661  
September 30, 2019 $ 271   $ 271