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Investments - Investments in Variable Interest Entities (Parenthetical) (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Receivables from related parties	$ 14,273,000	$ 7,748,000
Maximum exposure to loss	2,800,000	2,100,000
Aqua [Member]
Variable Interest Entity [Line Items]
Receivables from related parties	980,000
Subordinated Loan [Member] | Aqua [Member]
Variable Interest Entity [Line Items]
Receivables from related parties	980,000.0	980,000.0
Maximum exposure to loss	$ 980,000.0	$ 980,000.0

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- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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