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Non-controlling Interests - Additional Information (Detail)
 12 Months Ended
Jul. 21, 2017
CAD ($)
Jul. 21, 2017
USD ($)
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Disclosure of noncontrolling interests [line items]        
Proceeds from issuing shares $ 62,745,000 $ 50,000,000   $ 60,225,368
The subsidiaries with the exception of isoEnergy [member]        
Disclosure of noncontrolling interests [line items]        
Proportion of ownership interest in subsidiary     100.00%  
IsoEnergy Ltd. [member]        
Disclosure of noncontrolling interests [line items]        
Proportion of ownership interest in subsidiary     53.35% 63.90%
Increase in number of flow through shares outstanding     10,848,200 999,999
Common shares to related parties     7,022,520  
Proceeds from issuing shares | $     $ 7,710,764 $ 1,100,000
Increase in number of shares outstanding, issued to an unrelated third party     102,600  
Issue of shares for exploration and evaluation assets       4,000,000
IsoEnergy Ltd. [member] | Radio Property [member]        
Disclosure of noncontrolling interests [line items]        
Issue of shares for exploration and evaluation assets       3,000,000
IsoEnergy Ltd. [member] | Geiger Property [member]        
Disclosure of noncontrolling interests [line items]        
Issue of shares for exploration and evaluation assets     3,330,000 1,000,000
IsoEnergy Ltd. [member] | Laroque East uranium exploration property [member]        
Disclosure of noncontrolling interests [line items]        
Issue of shares for exploration and evaluation assets     1,000,000