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v3.21.2

Revenue - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2021 country
Non-US And Canada [Member] |
Disaggregation of Revenue [Line Items] |
Number of countries in which entity operates | 18
Minimum |
Disaggregation of Revenue [Line Items] |
Payment period | 30 days
Termination period | 30 days
Maximum |
Disaggregation of Revenue [Line Items] |
Payment period | 60 days
Termination period | 90 days

X
- Definition Revenue From Contract With Customer, Payment Period + References No definition available. + Details
Name: | stgw_RevenueFromContractWithCustomerPaymentPeriod
Namespace Prefix: | stgw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue From Contract With Customer, Termination Period + References No definition available. + Details
Name: | stgw_RevenueFromContractWithCustomerTerminationPeriod
Namespace Prefix: | stgw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=stgw_NonUSAndCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |