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Outstanding Common Stock Equivalents That Were Anti-Dilutive Tickmarks (Detail) | 12 Months Ended
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Dec. 31, 2015 $ / shares
Earnings Per Share [Abstract] |
Anti-dilutive Non-Vested Stock Weighted Average Grant Date Fair Value | $ 61.15

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- Definition Anti-dilutive Non-Vested Stock Weighted Average Grant Date Fair Value + References No definition available. + Details
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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_
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Balance Type: | na
Period Type: | duration