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Investments - Investments in Variable Interest Entities (Detail) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Variable Interest Entity [Line Items] |  |  |
Maximum Exposure to Loss |  | $ 4,500,000 | $ 4,800,000
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment | [1] | 1,343,000 | 1,258,000
Maximum Exposure to Loss | [1] | $ 2,323,000 | $ 2,238,000
[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.

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