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Stock-Based Compensation (Narrative) (Details) (USD $)
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
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Feb. 28, 2008
Nov. 30, 2012
Restricted Stock Units
Aug. 31, 2012
Restricted Stock Units
May 31, 2012
Restricted Stock Units
Mar. 31, 2012
Restricted Stock Units
Mar. 31, 2012
Restricted Stock Units
Maximum
Mar. 31, 2012
Restricted Stock Units
Minimum
Nov. 30, 2012
Non-Qualified Options
Nov. 30, 2012
Dollar Thrifty
Mar. 31, 2012
Performance Stock Units
Mar. 31, 2012
Price Vesting Units
Mar. 31, 2012
Price Vesting Units
Maximum
Mar. 31, 2012
Price Vesting Units
Minimum
Dec. 31, 2012
Stock Option
Dec. 31, 2011
Stock Option
Dec. 31, 2010
Stock Option
Dec. 31, 2012
Stock Option
Maximum
Dec. 31, 2012
Stock Appreciation Rights (SARs)
Dec. 31, 2012
Restricted Stock Units RSU and Performance Stock Units PSU
Dec. 31, 2011
Restricted Stock Units RSU and Performance Stock Units PSU
Mar. 31, 2011
Performance Stock Units Psu Subject to Performance Condition
Mar. 31, 2011
Performance Stock Units Psu Subject to Market Condition
Dec. 31, 2012
Prior Plans
Dec. 31, 2012
Omnibus Plan
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
Mar. 31, 2012
PVUs subject to performance condition
Minimum
Dec. 31, 2012
PVUs subject to market condition
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
Dec. 31, 2011
Employee Stock
Dec. 31, 2010
Employee Stock
Dec. 31, 2012
Employee Stock
Maximum
Dec. 31, 2012
Employee Stock
Minimum
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