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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Liabilities:
Deferred consideration (Note 10)	$ 179,831	$ 200,290
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	336	930
Total	148,018	148,590
Liabilities:
Deferred consideration (Note 10)	179,831	200,290
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Other assets fair value disclosure	4,901
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Other assets fair value disclosure	4,937
Fair Value, Measurements, Recurring [Member] | Fixed Income Investments [Member]
Assets:
Other assets fair value disclosure	1,915
Fair Value, Measurements, Recurring [Member] | Other Investment Companies [Member]
Assets:
Other assets fair value disclosure	660
Fair Value, Measurements, Recurring [Member] | Securrency Convertible Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	10,051	14,500
Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value	33,728	23,772
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Financial instruments owned, at fair value	2,993	2,980
Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value	81,046	96,837
Fair Value, Measurements, Recurring [Member] | Other assets—seed capital (WisdomTree blockchain-enabled funds) [Member]
Assets:
Financial instruments owned, at fair value		1,765
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Financial instruments owned, at fair value		885
Fair Value, Measurements, Nonrecurring [Member] | Other Investments [Member]
Assets:
Investment owned, at fair value		312
Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	3,588
Fnality Convertible Note [Member] | Fair Value, Measurements, Recurring [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	7,451	6,921
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	336	930
Total	70,247	50,972
Liabilities:
Deferred consideration (Note 10)	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Other assets fair value disclosure	4,901
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Other assets fair value disclosure	4,937
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Income Investments [Member]
Assets:
Other assets fair value disclosure	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investment Companies [Member]
Assets:
Other assets fair value disclosure	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Securrency Convertible Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value	33,728	23,772
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Financial instruments owned, at fair value	2,993	2,980
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value	23,352	23,290
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other assets—seed capital (WisdomTree blockchain-enabled funds) [Member]
Assets:
Financial instruments owned, at fair value		0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Financial instruments owned, at fair value		0
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Investments [Member]
Assets:
Investment owned, at fair value		0
Level 1 [Member] | Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	0
Level 1 [Member] | Fnality Convertible Note [Member] | Fair Value, Measurements, Recurring [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	0	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	0	0
Total	60,269	76,197
Liabilities:
Deferred consideration (Note 10)	0	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Other assets fair value disclosure	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Other assets fair value disclosure	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Income Investments [Member]
Assets:
Other assets fair value disclosure	1,915
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investment Companies [Member]
Assets:
Other assets fair value disclosure	660
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Securrency Convertible Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	0	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value	0	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Financial instruments owned, at fair value	0	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value	57,694	73,547
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other assets—seed capital (WisdomTree blockchain-enabled funds) [Member]
Assets:
Financial instruments owned, at fair value		1,765
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Financial instruments owned, at fair value		885
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Investments [Member]
Assets:
Investment owned, at fair value		0
Level 2 [Member] | Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	0
Level 2 [Member] | Fnality Convertible Note [Member] | Fair Value, Measurements, Recurring [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	0	0
Total	17,502	21,421
Liabilities:
Deferred consideration (Note 10)	179,831	200,290
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Other assets fair value disclosure	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Income Investments [Member]
Assets:
Other assets fair value disclosure	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investment Companies [Member]
Assets:
Other assets fair value disclosure	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Securrency Convertible Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	10,051	14,500
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Financial instruments owned, at fair value	0	0
Other assets fair value disclosure	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other assets—seed capital (WisdomTree blockchain-enabled funds) [Member]
Assets:
Financial instruments owned, at fair value		0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Financial instruments owned, at fair value		0
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Investments [Member]
Assets:
Investment owned, at fair value		312
Level 3 [Member] | Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	3,588
Level 3 [Member] | Fnality Convertible Note [Member] | Fair Value, Measurements, Recurring [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	$ 7,451	$ 6,921

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Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

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Amount of liability arising from deferred consideration in a business combination.

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