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Commitments and Contingencies - Schedule of other contractual obligation related to bank debt and interest (Parenthetical) (Detail) $ in Millions | Dec. 31, 2022 USD ($)
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Revolving Facility [member] |
Commitments and Contingencies [Line Items] |
Borrowings | $ 497.5
Revolving Facility [member] | Secured Overnight Financing Rate Data [Member] | Bottom of Range [member] |
Commitments and Contingencies [Line Items] |
Borrowings, adjustment to interest rate basis | 1.875%
Revolving Facility [member] | Secured Overnight Financing Rate Data [Member] | Top of Range [member] |
Commitments and Contingencies [Line Items] |
Borrowings, adjustment to interest rate basis | 3.50%
Undrawn Revolving Facility [Member] | Secured Overnight Financing Rate Data [Member] | Bottom of Range [member] |
Commitments and Contingencies [Line Items] |
Standby fee percentage on undrawn portion of revolving facility | 0.4219%
Undrawn Revolving Facility [Member] | Secured Overnight Financing Rate Data [Member] | Top of Range [member] |
Commitments and Contingencies [Line Items] |
Standby fee percentage on undrawn portion of revolving facility | 0.7875%

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_7&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_BorrowingsAdjustmentToInterestRateBasis
Namespace Prefix: | ifrs-full_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Commitments and contingencies. + References No definition available. + Details
Name: | sand_CommitmentsAndContingenciesLineItems
Namespace Prefix: | sand_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Standby fee percentage on undrawn portion of revolving facility. + References No definition available. + Details
Name: | sand_StandbyFeePercentageOnUndrawnPortionOfRevolvingFacility
Namespace Prefix: | sand_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=sand_SecuredOvernightFinancingRateDataMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |