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Segment Reporting - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Segment	Dec. 31, 2021 USD ($) Segment	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | Segment	4	4
Investment Advice [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,303,315	$ 5,170,707	$ 4,092,549
Investment Advice [Member] | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | No Major Customer [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		10.00%	10.00%
Blackstone Real Estate Investment Trust or BREIT [Member] | Investment Advice [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 841,300

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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