Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Liabilities:
Deferred consideration—gold payments (Note 9)	$ 0	$ 200,290
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	195	930
Total	96,289	148,590
Liabilities:
Deferred consideration—gold payments (Note 9)		200,290
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Other assets fair value disclosure	4,794
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Other assets fair value disclosure	5,514
Fair Value, Measurements, Recurring [Member] | Fixed Income Investments [Member]
Assets:
Other assets fair value disclosure	1,908
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	13,836	14,500
Fair Value, Measurements, Recurring [Member] | Securrency Convertible Secured Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	8,887
Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value	26,509	23,772
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Financial instruments owned, at fair value		2,980
Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value	26,107	96,837
Fair Value, Measurements, Recurring [Member] | Other assets—seed capital (WisdomTree Digital 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 [Member] | 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	7,879	6,921
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	195	930
Total	37,012	50,972
Liabilities:
Deferred consideration—gold payments (Note 9)		0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Other assets fair value disclosure	4,794
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Other assets fair value disclosure	5,514
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] | Securrency Convertible Secured Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value	26,509	23,772
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Assets:
Financial instruments owned, at fair value		2,980
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value	0	23,290
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other assets—seed capital (WisdomTree Digital 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 [Member] | 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	28,675	76,197
Liabilities:
Deferred consideration—gold payments (Note 9)		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	1,908
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] | Securrency Convertible Secured Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	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
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value	26,107	73,547
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other assets—seed capital (WisdomTree Digital 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 [Member] | 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	30,602	21,421
Liabilities:
Deferred consideration—gold payments (Note 9)		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	13,836	14,500
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Securrency Convertible Secured Note [Member]
Investments in Convertible Notes
Investments, Fair value disclosure	8,887
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
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 Digital 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 [Member] | 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	$ 7,879	$ 6,921