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ACQUISITIONS AND DIVESTITURES - Narrative (Details) |  |  |  |  | 6 Months Ended | 12 Months Ended |  |
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Oct. 21, 2021 USD ($) | Sep. 16, 2020 USD ($) shares | Sep. 15, 2020 USD ($) shares | Sep. 18, 2019 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 02, 2021 USD ($) property | Dec. 02, 2021 $ / shares | Sep. 17, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Termination fee paid by acquirer |  |  |  |  |  |  |  |  | $ 300,000 |  |
Transaction, integration and SEC conversion expense |  |  |  |  |  | $ 11,240,000 | $ 20,813,000 | $ 0 |  |  |
Consideration |  |  |  |  |  | 4,918,000 | 7,782,000 |  |  |  |
Non-controlling interest |  |  |  |  |  | 514,661,000 | 512,279,000 |  |  |  |
Income (loss) from equity method investments |  |  |  |  |  | (2,952,000) | (1,426,000) | $ 0 |  |  |
Royalty Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value | $ 83,900,000 |  |  |  |  |  |  |  |  |  |
Consideration | 87,900,000 |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  | $ 22,300,000 |  |  |  |  |  |
Gain on disposal | 2,100,000 |  |  |  |  |  |  |  |  |  |
Transaction costs | $ 300,000 |  |  |  |  |  |  |  |  |  |
Royalty Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Measurement Input, Discount Rate |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred consideration, rate | 0.125 |  |  |  |  |  |  |  |  |  |
Puna |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 25.00% |  |  |  |  |  |  |
Consideration |  |  |  | $ 32,400,000 |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  | 2,300,000 |  |  |  |  |  |  |
Extinguishment of loans and related interests |  |  |  | 11,400,000 |  |  |  |  |  |  |
Equity interests issued and issuable |  |  |  | 18,200,000 |  |  |  |  |  |  |
Equity interests subject to cancellation |  |  |  | 500,000 |  |  |  |  |  |  |
Non-controlling interest |  |  |  | 0 |  |  |  |  |  |  | $ 33,900,000
Income (loss) from equity method investments |  |  |  | 1,500,000 |  |  |  |  |  |  |
Transaction cost |  |  |  | $ 200,000 |  |  |  |  |  |  |
Taiga Gold Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (in CAD per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.265 |
Equity interest issued or issuable, value assigned |  |  |  |  |  |  |  |  | $ 21,000,000 |  |
Shareholder approval, percentage of votes required |  |  |  |  |  |  |  |  | 66.67% |  |
Termination fee paid by acquiree |  |  |  |  |  |  |  |  | $ 1,200,000 |  |
Number of new properties added | property |  |  |  |  |  |  |  |  | 5 |  |
Taiga Gold Corporation | Fisher Property |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00% |  |
Step acquisition, equity interest in acquiree, percentage |  |  |  |  |  |  |  |  | 80.00% |  |
Taiga Gold Corporation | Amisk, Alberta, Canada |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of property ownership |  |  |  |  |  |  |  |  | 100.00% |  |
Taiga Gold Corporation | Taiga Gold Corporation | Fisher Property |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 20.00% |  |
Alacer Gold Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  | 57.00% |  |  |  |  |  |  |  |  |
Percentage of voting interests held by former shareholders |  | 43.00% |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 2,179,647,000 | $ 2,200,000,000 |  |  |  |  |  |  |  |
Transaction, integration and SEC conversion expense |  |  |  |  |  | $ 6,900,000 | 20,800,000 |  |  |  |
Severance and termination payments |  |  |  |  |  |  | 11,000,000 |  |  |  |
Revenue |  |  |  |  |  |  | 205,500,000 |  |  |  |
Net income |  |  |  |  |  |  | $ 24,100,000 |  |  |  |
Alacer Gold Corporation | Anagold |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 80.00% |  |  |  |  |  |  |  |  |
Alacer Gold Corporation | Lidya Mining |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  | 20.00% |  |  |  |  |  |  |  |  |
Alacer Gold Corporation | Common shares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interests issued and issuable, entity shares issued per acquiree, ratio |  | 0.3246 |  |  |  |  |  |  |  |  |
Equity interest issued or issuable, number of shares (in shares) | shares |  | 95,699,911 | 95,699,911 |  |  |  |  |  |  |  |

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