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Income taxes (Tables)
 12 Months Ended
Dec. 31, 2019
Major components of tax expense (income) [abstract]  
Disclosure of detailed information about income taxes [Table Text Block]
      2019     2018  
      $     $  
             
Current income tax            
  Expense for the year   797     797  
  Adjustment in respect of prior years   -     25  
Current income tax expense   797     822  
               
Deferred income tax (Note 24 (b)):            
  Origination and reversal of temporary differences   (45,186 )   (36,471 )
  Impact of changes in tax rates   98     253  
  Change in unrecognized deductible temporary differences   3,891     25  
  Adjustments in respect of prior years   -     223  
Deferred income tax recovery   (41,197 )   (35,970 )
Income tax recovery   (40,400 )   (35,148 )
Disclosure of reconciliation of statutory weighted average tax rate applicable to income [Table Text Block]

        2019     2018  
        $     $  
             
Loss before income taxes   (274,595 )   (140,735 )
                 
Income tax provision calculated using the combined Canadian federal            
    and provincial statutory income tax rate   (73,042 )   (37,576 )
Increase (decrease) in income taxes resulting from:            
  Non-deductible expenses, net   738     719  
  Non-deductible portion of capital losses, net   4,877     856  
  Non-deductible (non-taxable) foreign exchange loss (gain)   (357 )   787  
  Tax rate changes of deferred income taxes   98     253  
  Differences in foreign statutory tax rates   19,758     (1,043 )
  Foreign withholding taxes   584     583  
  Share of equity loss of associates   2,954     -  
  Tax benefits not recognized   3,891     25  
  Other, net   99     248  
Total income tax recovery   (40,400 )   (35,148 )
Disclosure of components of deferred income tax assets and liabilities [Table Text Block]
    December 31,     December 31,  
      2019     2018  
      $     $  
Deferred tax assets:            
  Stream interests   28,826     7,133  
  Deferred and restricted share units   2,865     2,032  
  Share and debt issue expenses   (113 )   989  
  Other assets   149     120  
  Non-capital losses   170     -  
      31,897     10,274  
Deferred tax liabilities:            
  Royalty interests and exploration and evaluation assets   (77,641 )   (88,787 )
  Convertible debentures   (3,632 )   (4,866 )
  Investments   1,911     (3,898 )
      (79,362 )   (97,551 )
Deferred tax liability, net   (47,465 )   (87,277 )
Disclosure of deferred taxes [Table Text Block]

    Dec. 31,
2018		     Statement
of loss		     Equity     Other comprehen-sive income     Translation adjustments     Dec. 31,
2019		  
    $     $     $     $     $     $  
Deferred tax assets:                                    
  Stream interests   7,133     21,693     -     -     -     28,826  
  Share and debt issue expenses   989     (1,036 )   (66 )   -     -     (113 )
  Deferred and restricted share units   2,032     726     107     -     -     2,865  
  Non-capital losses   -     170     -     -     -     170  
  Other assets   120     29     -     -     -     149  
                                     
Deferred tax liabilities:                                    
  Royalty interests and exploration
    and evaluation assets		   (88,787 )   11,769     -     (949 )   326     (77,641 )
  Investments   (3,898 )   6,612     -     (803 )   -     1,911  
  Convertible debentures   (4,866 )   1,234     -     -     -     (3,632 )
    (87,277 )   41,197     41     (1,752 )   326     (47,465 )

    Dec. 31,
2017		     Statement
of loss		     Equity     Other comprehen-sive income     Translation adjustments     Dec. 31,
2018		  
    $     $     $     $     $     $  
Deferred tax assets:                                    
  Stream interests   7,793     (660 )   -     -     -     7,133  
  Share and debt issue expenses   2,286     (1,297 )   -     -     -     989  
  Deferred and restricted share units   2,032     (140 )   140     -     -     2,032  
  Non-capital losses   1,015     (1,015 )   -     -     -     -  
  Other assets   223     (103 )   -     -     -     120  
                                     
Deferred tax liabilities:                                    
  Royalty interests and exploration
    and evaluation assets		   (123,772 )   37,574     -     (2,038 )   (551 )   (88,787 )
  Investments   (10,054 )   192     -     5,964     -     (3,898 )
  Convertible debentures   (6,047 )   1,181     -     -     -     (4,866 )
  Other liabilities   (238 )   238     -     -     -     -  
    (126,762 )   35,970     140     3,926     (551 )   (87,277 )