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Goodwill and Intangible Assets - Additional Information (Detail)
CAD in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fund
Dec. 31, 2017
CAD
Fund
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2016
USD ($)
Indefinite-lived Intangible Assets [Line Items]            
Goodwill, impairment loss $ 0       $ 1,676  
Acquisition of the right to manage Questrade Wealth Management Inc.'s ETFs (Note 18)       $ 2,132    
Intangible asset related to its customary advisory agreement   $ 12,085   12,085 9,953  
Questrade ETFs [Member]            
Indefinite-lived Intangible Assets [Line Items]            
Intangible asset related to its customary advisory agreement   $ 2,132   2,132    
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 CAD 99,108      
Acquisition of the right to manage Questrade Wealth Management Inc.'s ETFs (Note 18)   2,132 CAD 2,675      
GreenHaven Commodity Services, LLC [Member]            
Indefinite-lived Intangible Assets [Line Items]            
Intangible asset related to its customary advisory agreement   $ 9,953   $ 9,953 $ 9,953 $ 9,953