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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Related Party Transaction [Line Items]    
Purchase of Non- controlling Interest $ 0 $ 306
Partnership And Trust [Member]    
Related Party Transaction [Line Items]    
Purchase of Non- controlling Interest $ 0 $ 306