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Investments - Investments in Variable Interest Entities Table Footnote (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Receivables from related parties $ 5,237,000 $ 11,915,000
Aqua    
Variable Interest Entity [Line Items]    
Receivables from related parties 980,000  
Subordinated Loan | Aqua    
Variable Interest Entity [Line Items]    
Receivables from related parties $ 980,000