REVENUE - Property Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue
Total revenue	$ 252,068	$ 193,837	$ 655,148	$ 516,835
Stream interest
Disaggregation of Revenue
Total revenue	166,081	133,052	421,754	358,531
Stream interest | Mount Milligan
Disaggregation of Revenue
Total revenue	61,057	56,570	167,520	143,704
Stream interest | Pueblo Viejo
Disaggregation of Revenue
Total revenue	28,141	26,585	82,509	64,147
Stream interest | Andacollo
Disaggregation of Revenue
Total revenue	23,022	9,652	45,255	31,949
Stream interest | Other
Disaggregation of Revenue
Total revenue	53,861	40,245	126,470	118,731
Royalty revenue:
Disaggregation of Revenue
Total revenue	85,987	60,785	233,394	158,304
Royalty revenue: | Cortez Legacy Zone
Disaggregation of Revenue
Total revenue	6,782	13,047	26,432	41,610
Royalty revenue: | Cortez CC Zone
Disaggregation of Revenue
Total revenue	10,412	2,739	22,054	7,713
Royalty revenue: | Other
Disaggregation of Revenue
Total revenue	$ 68,793	$ 44,999	$ 184,908	$ 108,981