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Business Combinations (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Apr. 03, 2023	Dec. 31, 2022	Jun. 30, 2022
Business Acquisition [Line Items]
Goodwill	$ 656,674		$ 653,524	$ 654,709
Rothschild & Co Asset Management U.S.
Business Acquisition [Line Items]
Assets acquired in acquisition		$ 12,600
Goodwill		$ 2,600

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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