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Outstanding Common Stock Equivalents That Were Anti-Dilutive Tickmarks (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share [Abstract] |  |  |
Anti-dilutive Non-Vested Stock Weighted Average Grant Date Fair Value | $ 39.48 | $ 48.66 | $ 38.40

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Namespace Prefix: | car_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration