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Accounts and Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts and notes receivable |  |
Total accounts and notes receivable | $ 154,971 us-gaap_AccountsReceivableGrossCurrent | $ 137,463 us-gaap_AccountsReceivableGrossCurrent
Less allowance for doubtful accounts | 3,641 us-gaap_AllowanceForDoubtfulAccountsReceivable | 2,405 us-gaap_AllowanceForDoubtfulAccountsReceivable
Accounts and notes receivable, net | 151,330 us-gaap_AccountsNotesAndLoansReceivableNetCurrent | 135,058 us-gaap_AccountsNotesAndLoansReceivableNetCurrent
Amounts due from manufacturers [Member] |  |
Accounts and notes receivable |  |
Total accounts and notes receivable | 86,100 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_AmountsDueFromManufacturersMember | 78,131 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_AmountsDueFromManufacturersMember
Parts and service receivables [Member] |  |
Accounts and notes receivable |  |
Total accounts and notes receivable | 35,034 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_PartsAndServiceReceivablesMember | 31,950 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_PartsAndServiceReceivablesMember
Finance and insurance receivables, net [Member] |  |
Accounts and notes receivable |  |
Total accounts and notes receivable | 20,898 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_FinanceAndInsuranceReceivablesNetMember | 19,283 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_FinanceAndInsuranceReceivablesNetMember
Other [Member] |  |
Accounts and notes receivable |  |
Total accounts and notes receivable | $ 12,977 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_OtherReceivableMember | $ 8,099 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gpi_OtherReceivableMember

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- Definition The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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