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Variable Interest Entities - Summary of Information about Variable Interests (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Carrying Amount - Assets |  |
Total net carrying value | $ 885,217 | $ 896,692
Securrency Inc [Member] |  |
Carrying Amount - Assets |  |
Preferred stock – Series A Shares | 8,349 | 8,112
Preferred stock – Series B Shares | 5,500 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Carrying Amount - Assets |  |
Total net carrying value | 13,849 | 8,112
Maximum exposure to loss | $ 13,849 | $ 8,112

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