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Non-controlling Interests - Summary of Financial Information for IsoEnergy Ltd (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of noncontrolling interests [line items]    
Cash $ 201,804  
Marketable securities 9,315 $ 0
Total assets 546,563 357,392
Current liabilities 8,205 7,322
Total liabilities 85,215 238,140
Loss from operations (125,826) (113,788)
Loss and comprehensive loss (122,213) (116,618)
Net cash flow from operating activities (16,788) (10,628)
Net cash flow from investing activities (46,713) (18,233)
Net cash flow from financing activities 191,351 51,227
Net increase (decrease) in cash 127,782 21,904
Subsidiaries with material non-controlling interests [member]    
Disclosure of noncontrolling interests [line items]    
Cash 13,617 14,035
Other current assets 236 265
Marketable securities 9,315  
Non-current assets 61,022 53,923
Total assets 84,190 68,223
Current liabilities 641 305
Non-current liabilities 27,636 14,831
Total liabilities 28,277 15,136
Loss from operations 15,781 9,543
Loss and comprehensive loss 10,819 9,616
Net cash flow from operating activities (2,751) (2,532)
Net cash flow from investing activities (5,336) (5,664)
Net cash flow from financing activities 7,669 15,643
Net increase (decrease) in cash $ (418) $ 7,447