Investments - Investments in Variable Interest Entities Table Footnote (Detail) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Receivables from related parties	$ 8,378,000	$ 5,237,000
Maximum Exposure to Loss	4,300,000	$ 4,500,000
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
Maximum Exposure to Loss	$ 980,000