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v3.20.4

Stock-Based Compensation - Stock Unit Valuation Assumptions (Detail) | 12 Months Ended
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Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share Based Compensation Percentage In Annual Base Salary, Min | 50.00%
Share Based Compensation Percentage In Annual Base Salary, Max | 100.00%

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- Definition Share Based Compensation Percentage In Annual Base Salary, Max + References No definition available. + Details
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Namespace Prefix: | car_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Share based compensation percentage in annual base salary, min. + References No definition available. + Details
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Namespace Prefix: | car_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration