Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
Oct. 02, 2013
Dec. 31, 2013
Dealerships
Store
Collision
Brand
State
Dec. 31, 2012
Dec. 31, 2011
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Number of dealerships   123    
Number of states   14    
Number of different brands of cars and light trucks   25    
Number of collision repair centers   21    
Number of stores   102    
Percentage of dealership that is accounted for under the equity method   50.00%    
Book overdraft position   $ 41,000,000 $ 39,900,000  
Revenue allowances for commission reserves   14,900,000 13,200,000  
Amount recognized for continue operation   37,900,000 32,100,000 25,300,000
Additional amount recognized for discontinued operation     900,000 1,400,000
Term for funding of finance contracts   10 days    
Contracts in transit receivables   190,000,000 183,200,000  
Goodwill impairment 0 0 0 0
Goodwill   476,315,000 454,224,000 468,465,000
Franchise asset impairment charge   600,000    
Insurance reserves   23,600,000 23,400,000  
Deposits   65,000,000 60,000,000  
Reduction in interest expense   1,000,000 300,000  
Total outstanding balance of financial instruments and market risks   1,300,000,000 1,200,000,000  
Advertising expense   56,600,000 50,300,000 49,100,000
Cooperative manufacturer credits advertising expenses   21,800,000 22,000,000 17,700,000
Automobile Manufacturers [Member]
        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Concentrations of credit risk with respect to receivables are limited primarily to automobile manufacturers   82,600,000 71,600,000  
Financial Institutions [Member]
        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Concentrations of credit risk with respect to receivables are limited primarily to financial institutions   $ 210,300,000 $ 204,900,000  
Minimum [Member]
        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Projected sales in the unit for next year   15,500,000    
Maximum [Member]
        
Description Of Business And Summary Of Significant Accounting Policies [Line Items]        
Projected sales in the unit for next year   16,000,000