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Royalty, stream and other interests - Disclosure of detailed information about royalty interests (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Royalty, Stream And Other Interests [Line Items]    
Beginning balance $ 1,414,668 $ 1,575,772
Acquisitions 90,102 141,101
NSR royalty on the Cariboo properties owned prior to the acquisition of Barkerville (56,070)  
Conversion   0
Transfer 0  
Disposal (49,393) (150,289)
Depletion (47,009) (52,612)
Impairment (193,591) (158,200)
Translation adjustment (28,195) 58,896
Ending balance 1,130,512 1,414,668
Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 707,723 770,530
Acquisitions 41,529 109,670
NSR royalty on the Cariboo properties owned prior to the acquisition of Barkerville (56,070)  
Conversion   0
Transfer (10,000)  
Disposal (2,277) 0
Depletion (20,908) (26,972)
Impairment (27,689) (153,639)
Translation adjustment (4,741) 8,134
Ending balance 627,567 707,723
Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 606,410 700,078
Acquisitions 48,573 31,431
NSR royalty on the Cariboo properties owned prior to the acquisition of Barkerville 0  
Conversion   4,278
Transfer 10,000  
Disposal 0 (150,289)
Depletion (23,335) (21,217)
Impairment (138,689) 0
Translation adjustment (19,795) 42,129
Ending balance 483,164 606,410
Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 100,535 105,164
Acquisitions 0 0
NSR royalty on the Cariboo properties owned prior to the acquisition of Barkerville 0  
Conversion   (4,278)
Transfer 0  
Disposal (47,116) 0
Depletion (2,766) (4,423)
Impairment (27,213) (4,561)
Translation adjustment (3,659) 8,633
Ending balance 19,781 100,535
Producing [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 726,913  
Cost 1,132,921 1,068,217
Accumulated depletion and impairment (500,348) (341,304)
Ending balance 632,573 726,913
Producing [Member] | Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 213,601  
Cost 604,950 510,738
Accumulated depletion and impairment (345,521) (297,137)
Ending balance 259,429 213,601
Producing [Member] | Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 455,905  
Cost 509,179 489,407
Accumulated depletion and impairment (141,826) (33,502)
Ending balance 367,353 455,905
Producing [Member] | Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 57,407  
Cost 18,792 68,072
Accumulated depletion and impairment (13,001) (10,665)
Ending balance 5,791 57,407
Development [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 454,057  
Cost 385,807 454,057
Accumulated depletion and impairment (79,549)  
Accumulated depletion   0
Ending balance 306,258 454,057
Development [Member] | Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 270,066  
Cost 185,636 270,066
Accumulated depletion and impairment 0  
Accumulated depletion   0
Ending balance 185,636 270,066
Development [Member] | Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 150,505  
Cost 168,290 150,505
Accumulated depletion and impairment (52,479)  
Accumulated depletion   0
Ending balance 115,811 150,505
Development [Member] | Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 33,486  
Cost 31,881 33,486
Accumulated depletion and impairment (27,070)  
Accumulated depletion   0
Ending balance 4,811 33,486
Exploration and evaluation    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 233,698  
Cost 191,681 233,698
Accumulated depletion 0 0
Ending balance 191,681 233,698
Exploration and evaluation | Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 224,056  
Cost 182,502 224,056
Accumulated depletion 0 0
Ending balance 182,502 224,056
Exploration and evaluation | Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 0  
Cost 0 0
Accumulated depletion 0 0
Ending balance 0 0
Exploration and evaluation | Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 9,642  
Cost 9,179 9,642
Accumulated depletion 0 0
Ending balance $ 9,179 $ 9,642