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Non-controlling Interests - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jul. 21, 2017 CAD ($) | Jul. 21, 2017 USD ($) | Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares
Disclosure of noncontrolling interests [line items] |  |  |  |
Proceeds from issuing shares | $ 62,745,000 | $ 50,000,000 |  | $ 60,225,368
The subsidiaries with the exception of isoEnergy [member] |  |  |  |
Disclosure of noncontrolling interests [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |
IsoEnergy Ltd. [member] |  |  |  |
Disclosure of noncontrolling interests [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 53.35% | 63.90%
Increase in number of flow through shares outstanding |  |  | 10,848,200 | 999,999
Common shares to related parties |  |  | 7,022,520 |
Proceeds from issuing shares | $ |  |  | $ 7,710,764 | $ 1,100,000
Increase in number of shares outstanding, issued to an unrelated third party |  |  | 102,600 |
Issue of shares for exploration and evaluation assets |  |  |  | 4,000,000
IsoEnergy Ltd. [member] | Radio Property [member] |  |  |  |
Disclosure of noncontrolling interests [line items] |  |  |  |
Issue of shares for exploration and evaluation assets |  |  |  | 3,000,000
IsoEnergy Ltd. [member] | Geiger Property [member] |  |  |  |
Disclosure of noncontrolling interests [line items] |  |  |  |
Issue of shares for exploration and evaluation assets |  |  | 3,330,000 | 1,000,000
IsoEnergy Ltd. [member] | Laroque East uranium exploration property [member] |  |  |  |
Disclosure of noncontrolling interests [line items] |  |  |  |
Issue of shares for exploration and evaluation assets |  |  | 1,000,000 |

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