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Variable interest entities - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets | $ 17,647,268 | $ 16,988,516
Liabilities | 14,864,893 | $ 14,091,736
Variable Interest Entity |  |
Assets | 300,849 |
Liabilities | $ 207,527 |

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