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Interim Financial Information (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Business and Organization [Line Items]      
Immaterial Error of Effect of Exchange Rate on Cash and Cash Equivalents $ (2,983)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents $ (12,254)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents  
Net Cash Provided by (Used in) Operating Activities 58,167us-gaap_NetCashProvidedByUsedInOperatingActivities 133,192us-gaap_NetCashProvidedByUsedInOperatingActivities  
Number of domestic regions 2gpi_Numberofdomesticregions    
Number of international regions 2gpi_Numberofinternationalregions    
Assets, Current 1,982,489us-gaap_AssetsCurrent   2,035,219us-gaap_AssetsCurrent
Total assets 4,098,467us-gaap_Assets   4,141,492us-gaap_Assets
Liabilities, Current 1,817,106us-gaap_LiabilitiesCurrent   1,922,199us-gaap_LiabilitiesCurrent
East [Member]      
Business and Organization [Line Items]      
Number of dealerships 40gpi_NumberOfDealerships
/ us-gaap_StatementGeographicalAxis
= gpi_EastMember
   
West [Member]      
Business and Organization [Line Items]      
Number of dealerships 76gpi_NumberOfDealerships
/ us-gaap_StatementGeographicalAxis
= gpi_WestMember
   
UNITED STATES      
Business and Organization [Line Items]      
Number of States in which Entity Operates 14us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_StatementGeographicalAxis
= country_US
   
UNITED KINGDOM      
Business and Organization [Line Items]      
Number of Towns in which Entity Operates 15gpi_NumberOfTownsInWhichEntityOperates
/ us-gaap_StatementGeographicalAxis
= country_GB
   
Number of dealerships 17gpi_NumberOfDealerships
/ us-gaap_StatementGeographicalAxis
= country_GB
   
BRAZIL      
Business and Organization [Line Items]      
Number of States in which Entity Operates 3us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_StatementGeographicalAxis
= country_BR
   
Number of dealerships 17gpi_NumberOfDealerships
/ us-gaap_StatementGeographicalAxis
= country_BR
   
Variable Interest Entity, Primary Beneficiary [Member]      
Business and Organization [Line Items]      
Assets, Current 14,447us-gaap_AssetsCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
  19,049us-gaap_AssetsCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Long-Lived Assets 26,179us-gaap_NoncurrentAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
  31,783us-gaap_NoncurrentAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Total assets 40,626us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
  50,832us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Liabilities, Current 12,821us-gaap_LiabilitiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
  16,374us-gaap_LiabilitiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Liabilities, Noncurrent 16,732us-gaap_LiabilitiesNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
  15,955us-gaap_LiabilitiesNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Liabilities $ 29,553us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
  $ 32,329us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember