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Goodwill and Intangible Assets - Summary of Indefinite-lived Intangible Assets (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Indefinite-lived Intangible Assets [Line Items] |  |
Beginning balance | $ 603,294 |
Decreases | (1,992) | [1]
Foreign currency translation | (55) |
Ending balance | 601,247 |
Acquisition Of Etfs Business [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Beginning balance | 601,247 |
Ending balance | 601,247 |
Questrade ETFs [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Beginning balance | 2,047 |
Decreases | (1,992) | [1]
Foreign currency translation | $ (55) |
[1] | Derecognized upon the sale of the Company’s Canadian ETF business (Note 25).

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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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