Outstanding Common Stock Equivalents That Were Anti-Dilutive Tickmarks (Detail) (USD $)	12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted average exercise price for anti-dilutive options	$ 17.12
Exercise price of warrants issued	$ 22.50car_ExercisePriceForWarrantsOutstanding

Antidilutive options, weighted average exercise price.

No definition available.

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