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Share capital (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CAD ($) share $ / shares shares | Dec. 31, 2018 CAD ($) $ / shares shares
Disclosure of classes of share capital [line items] |  |
NCIB description | In December 2019, Osisko renewed its normal course issuer bid ("NCIB") program. Under the terms of the 2019 NCIB program, Osisko may acquire up to 13,681,732 of its common shares from time to time in accordance with the normal course issuer bid procedures of the TSX. | In December 2018, Osisko renewed its normal course issuer bid ("NCIB") program. Under the terms of the 2018 NCIB program, Osisko could acquire up to 10,459,829 of its common shares from time to time in accordance with the normal course issuer bid procedures of the TSX.
Daily purchases of common shares, limit | shares | 126,674 | 71,940
Average daily trading volume | shares | 506,698 | 287,760
Purchased of cancellation share under 2017 NCIB program | shares |  | 1,860,299
Purchased of cancellation shares value under 2017 NCIB program | $ |  | $ 23,100
Purchased of cancellation share under 2018 NCIB program | shares | 983,900 | 849,480
Purchased of cancellation shares value under 2018 NCIB program | $ | $ 11,800 | $ 9,800
Average acquisition price per share | $ / shares | $ 12.02 | $ 12.16
Total purchased of cancellation shares of NCIB program | shares |  | 2,709,779
Total purchased of cancellation shares value of NCIB program | $ |  | $ 32,900
Accounts payable and accrued liabilities | $ |  | 1,700
Accordion feature | $ | $ 100,000 | $ 100,000
Common shares acquired and cancelled through share repurchase | shares | 12,385,717 |
Amount of Common shares acquired and cancelled through share repurchase | $ | $ 174,639 |
Dividend reinvestment plan [Member] |  |
Disclosure of classes of share capital [line items] |  |
Common shares elected to participate in dividend reinvestment plan | shares | 6,666,723 |
Dividends payable | $ | $ 300 |
Shares issued under dividend reinvestment plan | shares | 198,609 | 310,492
Discount under dividend reinvestment plan | 3.00% | 3.00%
Dividend reinvestment plan [Member] | January 15, 2020 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Shares issued under dividend reinvestment plan | shares | 28,351 |
Discount under dividend reinvestment plan | 3.00% |
Share repurchase and secondary offering [Member] |  |
Disclosure of classes of share capital [line items] |  |
Common shares acquired and cancelled through share repurchase | shares | 12,385,717 |
Amount of Common shares acquired and cancelled through share repurchase | $ | $ 174,600 |
Cash payment for common shares acquired and cancelled through share repurchase | $ | 129,500 |
Direct transfer of investments in associates and other investments for common shares acquired and cancelled through share repurchase | $ | $ 45,100 |
Percentage of reduction in basic common shares outstanding | 8.00% |
Share repurchase and secondary offering [Member] | First tranche [Member] |  |
Disclosure of classes of share capital [line items] |  |
Common shares acquired and cancelled through share repurchase | shares | 7,319,499 |
Amount of Common shares acquired and cancelled through share repurchase | $ | $ 103,200 |
Share repurchase and secondary offering [Member] | Second tranche [Member] |  |
Disclosure of classes of share capital [line items] |  |
Common shares acquired and cancelled through share repurchase | shares | 5,066,218 |
Amount of Common shares acquired and cancelled through share repurchase | $ | $ 71,400 |
Share capital [Member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued | share | 157,469,361 |
Amount of Common shares acquired and cancelled through share repurchase | $ | $ 128,516 |
Share capital [Member] | Share repurchase and secondary offering [Member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued | share | 7,850,000 |
Secondary offering price | $ / shares | $ 14.10 |
Additional common shares issued during period | shares | 1,177,500 |

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