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Non-controlling Interests - Summary of Financial Information for IsoEnergy Ltd (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of noncontrolling interests [line items]      
Cash and cash equivalents $ 125,059,189 $ 164,943,850 $ 31,090,313
Non-current assets 201,155,084 157,428,556  
TOTAL ASSETS 326,867,565 323,079,350  
Current liabilities 6,517,313 3,014,430  
Non-current liabilities 138,423,662 171,724,215  
Total liabilities 144,940,975 174,738,645  
Loss from operations 1,182,308 (56,863,922)  
Loss and comprehensive loss 2,092,427 (56,830,610)  
Net cash flow from operating activities (8,452,068) (11,144,497)  
Net cash flow from investing activities (37,767,642) 9,634,529  
Net cash flow from financing activities 2,429,425 135,105,106  
Net increase (decrease) in cash and cash equivalents (43,790,285) 133,595,138  
Subsidiaries with material non-controlling interests [member]      
Disclosure of noncontrolling interests [line items]      
Cash and cash equivalents 6,405,000 3,325,000  
Other current assets 155,000 67,000  
Non-current assets 43,511,000 39,124,000  
TOTAL ASSETS 50,071,000 42,516,000  
Current liabilities 817,000 247,000  
Non-current liabilities 199,000 281,000  
Total liabilities 1,016,000 528,000  
Loss from operations 2,142,000 2,516,000  
Loss and comprehensive loss 1,832,000 2,462,000  
Net cash flow from operating activities (1,679,000) (1,536,000)  
Net cash flow from investing activities (2,522,000) (2,647,000)  
Net cash flow from financing activities 7,282,000 1,017,000  
Net increase (decrease) in cash and cash equivalents $ 3,081,000 $ (3,166,000)