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Long-Term Debt (Details Textual) $ in Thousands, BRL in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 BRL | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 25, 2014 USD ($)
Long-term Debt (Textual) |  |  |  |  |  |
Current maturities of long-term debt |  |  |  | $ 76,442 | $ 72,630 |
Number of manufacturer-affiliated finance partners | 4 |  |  | 4 |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | $ 22,430 | $ 32,559 |  |  |
Capital Lease Obligations [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Debt, Weighted Average Interest Rate | 9.60% |  |  | 9.60% |  |
3.00% Convertible Senior Notes due 2020 [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 92,500 |  |  |
Note agreement with a third party financial institution |  |  |  |  |  | $ 115,000
5.00% Senior Note [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  | $ 552,800 | 534,900 |
Note agreement with a third party financial institution |  |  | $ 350,000 | 550,000 |  |
Debt Issuance Cost |  | $ 2,600 |  |  |  |
Unamortized debt issuance cost |  |  |  | 2,200 |  |
Ending date of installments to be repaid |  | Jun. 01, 2022 |  |  |  |
Other Real Estate Related Long Term Debt [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  |  |  | 152,600 | 158,100 |
Real Estate Related Debt [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Debt Issuance Cost |  | $ 1,300 |  |  |  |
Unamortized debt issuance cost |  |  |  | 400 |  |
Interest on real estate notes, minimum |  | 3.00% |  |  |  |
Interest on real estate notes, maximum |  | 5.47% |  |  |  |
Real Estate Related Debt [Member] | Minimum [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Variable Interest Rate |  | 1.50% |  |  |  |
Real Estate Related Debt [Member] | Maximum [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Variable Interest Rate |  | 2.55% |  |  |  |
Real Estate Related Debt [Member] | Toyota Motor Credit Corporation [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | $ 1,000 |  |  |  |
Maturity date of of notes |  | Nov. 01, 2021 |  |  |  |
Current maturities of long-term debt |  |  |  | 5,100 |  |
Amortization schedule | 20 years |  |  |  |  |
Total borrowings |  |  |  | 48,900 |  |
Number of loans as per loan agreements | 8 |  |  |  |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | $ 0 |  |  |  |
Real Estate Related Debt [Member] | Mercedes-Benz Financial Services [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 600 |  |  |  |
Ending date of installments to be repaid |  | Jan. 01, 2031 |  |  |  |
Current maturities of long-term debt |  |  |  | 1,200 |  |
Amortization schedule | 20 years |  |  |  |  |
Total borrowings |  |  |  | 26,800 |  |
Number of loans as per loan agreements | 2 |  |  |  |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | $ 0 |  |  |  |
Real Estate Related Debt [Member] | BMW Financial Services [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 2,200 |  |  |  |
Maturity date of of notes |  | Oct. 01, 2021 |  |  |  |
Current maturities of long-term debt |  |  |  | 4,600 |  |
Amortization schedule | 15 years |  |  |  |  |
Total borrowings |  |  |  | 63,700 |  |
Number of loans as per loan agreements | 14 |  |  |  |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | $ 0 |  |  |  |
Real Estate Related Debt [Member] | Ford Motor Credit Company [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 700 |  |  |  |
Ending date of installments to be repaid |  | Dec. 01, 2024 |  |  |  |
Amortization schedule | 20 years |  |  |  |  |
Foreign Note [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 1,500 |  |  |  |
Maturity date of of notes |  | Sep. 01, 2034 |  |  |  |
Current maturities of long-term debt |  |  |  | 4,800 |  |
Total borrowings |  |  |  | 63,000 |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | $ 0 |  |  |  |
Brazil Note [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Current maturities of long-term debt |  |  |  | 500 |  |
Total borrowings |  |  |  | 4,800 |  |
Brazilian third party financial institution [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 0 |  |  |  |
Ending date of installments to be repaid |  | Feb. 01, 2017 |  |  |  |
Current maturities of long-term debt |  |  |  | 11,700 |  |
Total borrowings | BRL 48.0 |  |  | 15,500 |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | $ 0 |  |  |  |
Third-party financial institution [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 4,800 |  |  |  |
Term loans provided under credit facility |  |  |  | 121,200 |  |
Ending date of installments to be repaid |  | Nov. 01, 2022 |  |  |  |
Current maturities of long-term debt |  |  |  | 6,100 |  |
Total borrowings |  |  |  | 110,200 |  |
Number of loans as per loan agreements | 18 |  |  |  |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | $ 0 |  |  |  |
Third-party financial institution [Member] | Ford Motor Credit Company [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Current maturities of long-term debt |  |  |  | 1,500 |  |
Total borrowings |  |  |  | 34,300 |  |
Number of loans as per loan agreements | 4 |  |  |  |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  | 0 |  |  |  |
Real Estate Credit Facility [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Debt Issuance Cost |  | 1,100 |  |  |  |
Unamortized debt issuance cost |  |  |  | 200 |  |
Available Borrowings Of Term Loans Under Real Estate Credit Facility |  |  |  | 25,000 |  |
Interest rate under condition second | 0.95% |  |  |  |  |
Percentage of principal payments to make its quarterly payment | 1.25% |  |  |  |  |
Borrowings under amended and restated mortgage facility |  | 0 |  |  |  |
Principal payments on outstanding borrowings |  | $ 1,700 |  |  |  |
Current maturities of long-term debt |  |  |  | 30,900 |  |
Variable Interest Rate |  | 2.00% |  |  |  |
Total borrowings |  |  |  | 56,300 |  |
Real Estate Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Ending date of installments to be repaid | Dec. 29, 2015 |  |  |  |  |
Real Estate Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Ending date of installments to be repaid |  | Feb. 27, 2017 |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Real Estate Credit Facility [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Interest rate under sub-condition three of condition second | 1.05% |  |  |  |  |
Federal Funds Rate [Member] | Real Estate Credit Facility [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Variable Interest Rate |  | 0.50% |  |  |  |
Fixed interest rate debt [Member] | Other Real Estate Related Long Term Debt [Member] |  |  |  |  |  |
Long-term Debt (Textual) |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  | $ 176,600 | $ 186,400 |

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- Details
Name: | gpi_DebtinterestratetypeAxis=gpi_FixedinterestratedebtMember
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