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Investments in Affiliates - Investments in Affiliates (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment [Line Items]    
Investments in affiliates $ 32,361us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 32,480us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Joint Venture Unconsolidated [Member]    
Investment [Line Items]    
Investments in affiliates 32,361us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= gva_JointVentureUnconsolidatedMember		 32,480us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= gva_JointVentureUnconsolidatedMember
Equity Method investments in Real Estate Affiliates [Member] | Joint Venture Unconsolidated [Member]    
Investment [Line Items]    
Investments in affiliates 22,623us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= gva_EquityMethodInvestmentsInRealEstateAffiliatesMember
/ dei_LegalEntityAxis
= gva_JointVentureUnconsolidatedMember		 21,392us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= gva_EquityMethodInvestmentsInRealEstateAffiliatesMember
/ dei_LegalEntityAxis
= gva_JointVentureUnconsolidatedMember
Other Affiliates [Member] | Joint Venture Unconsolidated [Member]    
Investment [Line Items]    
Investments in affiliates $ 9,738us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_OtherAffiliatesMember
/ dei_LegalEntityAxis
= gva_JointVentureUnconsolidatedMember		 $ 11,088us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_OtherAffiliatesMember
/ dei_LegalEntityAxis
= gva_JointVentureUnconsolidatedMember