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Label Element Value
APIC, Share-based Payment Arrangement, Increase for Cost Recognition us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue $ 49,895,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 7,561,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 11,936,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 934,000
Stockholders' Equity, Other1 stgw_StockholdersEquityOther1 300,000
Stockholders' Equity, Other1 stgw_StockholdersEquityOther1 (161,000)
Contribution from Limited Liability Company (LLC) stgw_ContributionFromLimitedLiabilityCompanyLLC 11,834,000
Contribution from Limited Liability Company (LLC) stgw_ContributionFromLimitedLiabilityCompanyLLC (250,000)
Stockholders' Equity, Other us-gaap_StockholdersEquityOther (55,000)
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination 778,658,000
Stock Repurchased and Retired During Period, Value us-gaap_StockRepurchasedAndRetiredDuringPeriodValue 820,000
Stock Issued During Period, Value, Restricted Stock Award, Gross us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross 0
Noncontrolling Interest [Member]  
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 0
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 11,936,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 934,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 7,561,000
Stockholders' Equity, Other1 stgw_StockholdersEquityOther1 (161,000)
Stockholders' Equity, Other1 stgw_StockholdersEquityOther1 300,000
Stockholders' Equity, Other us-gaap_StockholdersEquityOther 173,000
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination 636,416,000
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss 2,693,000
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss 6,774,000
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss 70,000
Adjustments to Additional Paid in Capital, Changes due to Business Combinations stgw_AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations (10,450,000)
Member Units [Member]  
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsDeclared 165,717,000
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsDeclared 204,929,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax (63,000)
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax (375,000)
Contribution from Limited Liability Company (LLC) stgw_ContributionFromLimitedLiabilityCompanyLLC (250,000)
Contribution from Limited Liability Company (LLC) stgw_ContributionFromLimitedLiabilityCompanyLLC 11,834,000
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination (178,372,000)
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss 3,032,000
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss 24,742,000
Redeemable noncontrolling interest, changes in redemption value stgw_Redeemablenoncontrollinginterestchangesinredemptionvalue 72,000
Redeemable noncontrolling interest, changes in redemption value stgw_Redeemablenoncontrollinginterestchangesinredemptionvalue (2,559,000)
Parent [Member]  
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsDeclared 165,717,000
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsDeclared 204,929,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 49,895,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax (375,000)
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 12,537,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax (63,000)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 0
Stockholders' Equity, Other1 stgw_StockholdersEquityOther1 0
Stockholders' Equity, Other1 stgw_StockholdersEquityOther1 0
Contribution from Limited Liability Company (LLC) stgw_ContributionFromLimitedLiabilityCompanyLLC 11,834,000
Contribution from Limited Liability Company (LLC) stgw_ContributionFromLimitedLiabilityCompanyLLC (250,000)
Stockholders' Equity, Other us-gaap_StockholdersEquityOther (228,000)
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination 142,242,000
Stock Repurchased and Retired During Period, Value us-gaap_StockRepurchasedAndRetiredDuringPeriodValue 820,000
Redeemable noncontrolling interest, changes in redemption value stgw_Redeemablenoncontrollinginterestchangesinredemptionvalue (2,559,000)
Redeemable noncontrolling interest, changes in redemption value stgw_Redeemablenoncontrollinginterestchangesinredemptionvalue (1,608,000)
Redeemable noncontrolling interest, changes in redemption value stgw_Redeemablenoncontrollinginterestchangesinredemptionvalue 72,000
Stock Issued During Period, Value, Restricted Stock Award, Gross us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross $ 0
Common Stock [Member]  
Adjustments to Additional Paid in Capital, Changes due to Business Combinations, Shares stgw_AdjustmentsToAdditionalPaidInCapitalChangesDueToBusinessCombinationsShares 0
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures 0
AOCI Attributable to Parent [Member]  
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 0
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 0
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 12,537,000
Stockholders' Equity, Other us-gaap_StockholdersEquityOther 0
Preferred Stock [Member]  
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination $ 209,980,000
Stock Issued During Period, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodNoncontrollingInterestIncreaseFromBusinessCombination 123,849,000
Additional Paid-in Capital [Member]  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue $ 49,895,000
Stockholders' Equity, Other us-gaap_StockholdersEquityOther (228,000)
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination 110,555,000
Stock Repurchased and Retired During Period, Value us-gaap_StockRepurchasedAndRetiredDuringPeriodValue 820,000
Adjustments to Additional Paid in Capital, Changes due to Business Combinations stgw_AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations 9,679,000
Stock Issued During Period, Value, Restricted Stock Award, Gross us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross 0
Retained Earnings [Member]  
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss (4,545,000)
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss 0
Net Income (Loss) Attributable to Parent us-gaap_NetIncomeLoss 0
Redeemable noncontrolling interest, changes in redemption value stgw_Redeemablenoncontrollinginterestchangesinredemptionvalue (1,608,000)
Common Class C [Member] | Common Stock [Member]  
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination $ 2,000
Stock Issued During Period, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodNoncontrollingInterestIncreaseFromBusinessCombination 179,970,051
Common Class A And B [Member] | Common Stock [Member]  
Stock Issued During Period, Value, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodValueNoncontrollingInterestIncreaseFromBusinessCombination $ 77,000
Stock Issued During Period, Noncontrolling Interest, Increase from Business Combination stgw_StockIssuedDuringPeriodNoncontrollingInterestIncreaseFromBusinessCombination 78,793,502
Stock Issued During Period, Shares, Restricted Stock Award, Gross us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 202,488
Stock Repurchased and Retired During Period, Shares us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 12,084