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Investments in debt and equity securities - Amortized Costs and Fair Values (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Amortized costs $ 22,710us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 17,441us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Total, Amortized costs 557,380us-gaap_AvailableForSaleSecuritiesAmortizedCost 528,833us-gaap_AvailableForSaleSecuritiesAmortizedCost
Debt securities, Fair values 551,867us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Equity securities, Fair values 28,236us-gaap_AvailableForSaleSecuritiesEquitySecurities 20,695us-gaap_AvailableForSaleSecuritiesEquitySecurities
Available for sale securities, Total 580,103us-gaap_AvailableForSaleSecurities 537,343us-gaap_AvailableForSaleSecurities
Municipal    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized costs 60,656us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_MunicipalDebtSecuritiesMember		 47,808us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_MunicipalDebtSecuritiesMember
Debt securities, Fair values 61,689us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_MunicipalDebtSecuritiesMember		 47,252us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_MunicipalDebtSecuritiesMember
Corporate    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized costs 296,578us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_CorporateAndUtilitiesMember		 285,104us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_CorporateAndUtilitiesMember
Debt securities, Fair values 308,691us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_CorporateAndUtilitiesMember		 291,832us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stc_CorporateAndUtilitiesMember
Foreign    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized costs 163,099us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		 164,146us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Debt securities, Fair values 166,685us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		 162,367us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
U.S. Treasury Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized costs 14,337us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 14,334us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Debt securities, Fair values $ 14,802us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 $ 15,197us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember