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Significant Accounting Policies - Summary of Reclassifications Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net Cash Provided by (Used in) Investing Activities [Abstract]
Net cash provided by operating activities	$ 50,109	$ 32,129
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net Cash Provided by (Used in) Investing Activities	(92,467)	11,954
Purchase of securities owned, a fair value	97,570	34,683
Proceeds from the sale of securities owned, at fair value	$ 10,976	18,122
Reclassification from Cash Flow Operating Activities To Investing Activities [Member]
Net Cash Provided by (Used in) Investing Activities [Abstract]
Net cash provided by operating activities		32,129
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net Cash Provided by (Used in) Investing Activities		11,954
Previously Reported [Member] | Reclassification from Cash Flow Operating Activities To Investing Activities [Member]
Net Cash Provided by (Used in) Investing Activities [Abstract]
Net cash provided by operating activities		15,568
Reclassification of net cash flows from securities purchases and sales		16,561
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net Cash Provided by (Used in) Investing Activities		28,515
Purchase of securities owned, a fair value		(34,683)
Proceeds from the sale of securities owned, at fair value		$ 18,122

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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Reclassification of net cash flows from securities purchases and sales.

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