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Schedule of Committed Credit Facilities Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
Bank Overdrafts [Member] | Minimum [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Interest Rate During Period 4.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BankOverdraftsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Bank Overdrafts [Member] | Maximum  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Interest Rate During Period 5.69%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BankOverdraftsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Revolving Credit Facility Maturing 2016 | Revolving Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= car_RevolvingCreditFacilityMaturingTwoThousandSixteenMember
Increase (decrease) in basis spread on variable rate 0.75%car_DebtInstrumentincreaseDecreaseinBasisSpreadonVariableRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= car_RevolvingCreditFacilityMaturingTwoThousandSixteenMember