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Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands, $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 11, 2018 USD ($)	Dec. 31, 2017 USD ($) Fund	Dec. 31, 2017 CAD ($) Fund	Dec. 31, 2018 USD ($)	Jan. 01, 2016 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement		$ 12,085		$ 603,209
Questrade ETFs [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement		$ 2,132		1,962
Questrade ETFs [Member] | WisdomTree Asset Management Canada, Inc [Member]
Indefinite-lived Intangible Assets [Line Items]
Number of ETF acquired by company | Fund		8	8
Assets under management		$ 77,403	$ 99,108
Business acquisition, cash paid		2,132	$ 2,675
GreenHaven Commodity Services, LLC [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement		9,953		$ 0	$ 9,953
GreenHaven Commodity Services, LLC [Member] | Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Fair value of intangible assets Projected Growth rate				0.00%
GreenHaven Commodity Services, LLC [Member] | Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Fair value of intangible assets Projected Growth rate				5.00%
Acquisition Of Etfs Business [Member]
Indefinite-lived Intangible Assets [Line Items]
Business acquisition, cash paid	$ 253,000
Intangible asset related to its customary advisory agreement		$ 0		$ 601,247
Weighted average cost of capital percentage	11.60%
Acquisition completion date				Apr. 11, 2018
Acquisition Of Etfs Business [Member] | Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Revenue growth multiple	3.00%
Acquisition Of Etfs Business [Member] | Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Revenue growth multiple	4.00%

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Assets under management of the eight Questrade ETFs being acquired and managed by the Company.

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