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Investments - Investments in Variable Interest Entities (Detail) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Variable Interest Entity [Line Items] |  |
Maximum Exposure to Loss | $ 4,800,000 | $ 4,800,000
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Investment | 1,223,000 | 1,258,000
Maximum Exposure to Loss | $ 2,203,000 | $ 2,238,000

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