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Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2019 | Apr. 11, 2018 | Dec. 31, 2017 USD ($) Fund | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Intangible asset related to its customary advisory agreement |  |  |  | $ 603,294 | $ 603,209
Questrade ETFs [Member] |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Intangible asset related to its customary advisory agreement |  |  |  | 2,047 | 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 |  |
Acquisition Of Etfs Business [Member] |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Intangible asset related to its customary advisory agreement |  |  | $ 0 | $ 601,247 | $ 601,247
Weighted average cost of capital percentage | 10.00% | 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% | 3.00% |  |  |
Acquisition Of Etfs Business [Member] | Maximum [Member] |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Revenue growth multiple | 9.00% | 4.00% |  |  |
Acquisition Of Etfs Business [Member] | Weighted Average [Member] |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Revenue growth multiple | 3.40% |  |  |  |

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