Variable interest entities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Variable Interest Entity [Line Items]
Assets	$ 17,816,512	$ 17,480,103
Liabilities	$ 16,690,695	$ 16,321,665
Variable Interest Entity Changes In Terms Of Arrangements	false
Variable Interest Entity
Variable Interest Entity [Line Items]
Assets	$ 794,532
Liabilities	$ 172,851

Amount of asset recognized for present right to economic benefit.

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Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others.

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