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Variable interest entities - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets	$ 17,633,940	$ 16,988,516
Liabilities	14,881,772	$ 14,091,736
Variable Interest Entity
Assets	307,877
Liabilities	$ 205,410

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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