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Goodwill and Intangible Assets - Summary of Indefinite-lived Intangible Assets (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
Indefinite-lived Intangible Assets [Line Items]  
Beginning balance $ 603,209
Foreign currency translation 82
Ending balance 603,291
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 1,962
Foreign currency translation 82
Ending balance $ 2,044