Stock-Based Compensation (Narrative) (Details) (USD $)
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12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Feb. 28, 2008
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Nov. 30, 2012
Restricted Stock Units
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Aug. 31, 2012
Restricted Stock Units
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May 31, 2012
Restricted Stock Units
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Mar. 31, 2012
Restricted Stock Units
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Mar. 31, 2012
Restricted Stock Units
Maximum
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Mar. 31, 2012
Restricted Stock Units
Minimum
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Nov. 30, 2012
Non-Qualified Options
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Nov. 30, 2012
Dollar Thrifty
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Mar. 31, 2012
Performance Stock Units
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Mar. 31, 2012
Price Vesting Units
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Mar. 31, 2012
Price Vesting Units
Maximum
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Mar. 31, 2012
Price Vesting Units
Minimum
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Dec. 31, 2012
Stock Option
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Dec. 31, 2011
Stock Option
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Dec. 31, 2010
Stock Option
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Dec. 31, 2012
Stock Option
Maximum
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Dec. 31, 2012
Stock Appreciation Rights (SARs)
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Dec. 31, 2012
Restricted Stock Units RSU and Performance Stock Units PSU
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Dec. 31, 2011
Restricted Stock Units RSU and Performance Stock Units PSU
|
Mar. 31, 2011
Performance Stock Units Psu Subject to Performance Condition
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Mar. 31, 2011
Performance Stock Units Psu Subject to Market Condition
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Dec. 31, 2012
Prior Plans
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Dec. 31, 2012
Omnibus Plan
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Dec. 31, 2012
Omnibus Plan
Restricted Stock Units RSU and Performance Stock Units PSU
|
Dec. 31, 2011
Omnibus Plan
Restricted Stock Units RSU and Performance Stock Units PSU
|
Mar. 31, 2012
PVUs subject to performance condition
Maximum
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Mar. 31, 2012
PVUs subject to performance condition
Minimum
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Dec. 31, 2012
PVUs subject to market condition
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Dec. 31, 2011
Restricted Stock Units RSU and Performance Stock Units PSU
|
Dec. 31, 2010
Restricted Stock Units RSU and Performance Stock Units PSU
|
Dec. 31, 2012
Performance Stock Units Psu Subject to Market Condition
Restricted Stock Units RSU and Performance Stock Units PSU
|
Dec. 31, 2011
Performance Stock Units Psu Subject to Market Condition
Restricted Stock Units RSU and Performance Stock Units PSU
|
Dec. 31, 2012
Employee Stock
employee
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Dec. 31, 2011
Employee Stock
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Dec. 31, 2010
Employee Stock
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Dec. 31, 2012
Employee Stock
Maximum
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Dec. 31, 2012
Employee Stock
Minimum
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Stock-Based Compensation | |||||||||||||||||||||||||||||||||||||||||
Number of shares authorized, reserved for issuance | 32,700,000 | 3,000,000 | |||||||||||||||||||||||||||||||||||||||
Shares of common stock underlying awards outstanding | 17,400,000 | 8,000,000 | 9,400,000 | ||||||||||||||||||||||||||||||||||||||
Number of shares available for grant | 16,900,000 | ||||||||||||||||||||||||||||||||||||||||
Granted (Shares) | 24,713 | 59,480 | 146,301 | 543,880 | 747,423 | 1,098,591 | 499,515 | 193,798 | 869,894 | 1,846,014 | |||||||||||||||||||||||||||||||
Weighted Average Outstanding | $ 13.15 | $ 12.12 | $ 15.48 | $ 14.47 | $ 13.65 | $ 13.65 | $ 11.26 | $ 10.13 | $ 12.62 | $ 6.46 | $ 12.18 | $ 13.34 | |||||||||||||||||||||||||||||
Variation in number of units that will ultimately be granted as percentage of the original grant | 150.00% | 0.00% | |||||||||||||||||||||||||||||||||||||||
Appreciation of stock price over the grant date price for options vesting in third year (as a percent) | 15.00% | ||||||||||||||||||||||||||||||||||||||||
Appreciation of stock price over the grant date price for options vesting in fourth year (as a percent) | 25.00% | ||||||||||||||||||||||||||||||||||||||||
Number of days of average trailing stock price which must equal or exceed a certain price target during the performance period | 20 days | 20 days | |||||||||||||||||||||||||||||||||||||||
Unrecognized compensation cost related to non-vested stock options, RSUs and PSUs granted | $ 38,000,000 | ||||||||||||||||||||||||||||||||||||||||
Period for recognition of total unrecognized compensation cost | 1 year 4 months 26 days | ||||||||||||||||||||||||||||||||||||||||
Award exercise price not less than fair market value of shares of common stock | 1 | ||||||||||||||||||||||||||||||||||||||||
Expected term (years) | 3 years | 6 years 3 months | 6 years 3 months | 10 years | |||||||||||||||||||||||||||||||||||||
Expected volatility rate top percentage of index universe in US Large Capitalization | 70.00% | ||||||||||||||||||||||||||||||||||||||||
Period for expected volatility rate daily historical closing values of index used | 6 years 3 months | ||||||||||||||||||||||||||||||||||||||||
Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions Expected Volatility Period | 5 years 9 months 15 days | ||||||||||||||||||||||||||||||||||||||||
Expected dividend yield | 0.00% | 0.00% | 0.00% | 0.00% | |||||||||||||||||||||||||||||||||||||
Number of common stock shares for each unit granted | 1 | ||||||||||||||||||||||||||||||||||||||||
Award vesting period | 3 years | 3 years | 3 years | ||||||||||||||||||||||||||||||||||||||
Award vesting percentage in first year | 25.00% | 25.00% | |||||||||||||||||||||||||||||||||||||||
Award vesting in second year | 25.00% | 25.00% | |||||||||||||||||||||||||||||||||||||||
Award vesting in third year | 50.00% | 50.00% | |||||||||||||||||||||||||||||||||||||||
Annual vesting percentage | 33.33% | ||||||||||||||||||||||||||||||||||||||||
Units to be awarded as percentage of original grant minimum | 0.00% | ||||||||||||||||||||||||||||||||||||||||
Units to be awarded as percentage of original grant, maximum | 150.00% | ||||||||||||||||||||||||||||||||||||||||
Award requisite service period | 5 years | ||||||||||||||||||||||||||||||||||||||||
Shares per employee, aggregate fair market value | 25,000 | ||||||||||||||||||||||||||||||||||||||||
Purchase price of common stock percent | 85.00% | ||||||||||||||||||||||||||||||||||||||||
Compensation expense | $ 30,300,000 | $ 31,000,000 | $ 36,600,000 | $ 800,000 | $ 700,000 | $ 600,000 | |||||||||||||||||||||||||||||||||||
Number of employees who participate in the plan | 1,800 | ||||||||||||||||||||||||||||||||||||||||
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exchange Grants, Gross | 35,492 | 6,000 | |||||||||||||||||||||||||||||||||||||||
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exchange Grants, Strike Price | $ 0.17 | $ 0.97 |