Investments - Investments in Variable Interest Entities (Detail) - USD ($)		Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Maximum Exposure to Loss		$ 3,700,000	$ 2,800,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investment	[1]	1,278,000	4,699,000
Maximum Exposure to Loss	[1]	$ 2,258,000	$ 5,679,000

[1] The Company has entered into a subordinated loan agreement with Aqua, whereby the Company agreed to lend the principal sum of $980 thousand. The Company’s maximum exposure to loss with respect to its unconsolidated VIEs includes the sum of its equity investments in its unconsolidated VIEs and the $980 thousand subordinated loan to Aqua.