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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) Dealerships State Brand Collision Store Franchise Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of dealerships | Dealerships | 116 |  |
Number of states | State | 13 |  |
Number of different brands of cars and light trucks | Brand | 25 |  |
Number of collision repair centers | Collision | 18 |  |
Noncurrent deferred tax asset included in other assets | $ 2,400,000 | $ 2,800,000 |
Net long-term deferred tax liability | 76,447,000 | 73,322,000 |
Current deferred tax asset included in other current assets | 0 | 13,600,000 |
Current deferred tax liability included in other accrued liabilities | 0 | 100,000 |
Book overdraft position | 8,000,000 | 38,500,000 |
Revenue allowances for commission reserves | 19,200,000 | 17,000,000 |
Amount recognized for continue operation | $ 45,000,000 | 42,100,000 | $ 39,700,000
Term for funding of finance contracts | 10 days |  |
Contracts in transit included in receivables, net | $ 236,400,000 | 196,300,000 |
Number of reporting units | Franchise | 2 |  |
Goodwill | $ 472,437,000 | 471,493,000 | 475,929,000
Insurance reserves | 22,700,000 | 24,900,000 |
Concentrations of credit risk with respect to receivables are limited primarily to automobile manufacturers | 92,800,000 | 90,300,000 |
Deposits | 10,000,000 | 74,000,000 |
Reduction in interest expense | 600,000 | 1,500,000 | 2,100,000
Advertising expense | 61,700,000 | 61,600,000 | 57,400,000
Cooperative manufacturer credits advertising expenses | $ 26,200,000 | 24,200,000 | 23,400,000
Number of reportable Segment | Segment | 2 |  |
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 | $ 265,300,000 | 221,600,000 |
Franchise Assets [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Franchise asset impairment charges | 0 | 3,300,000 |
Continuing Operations [Member] | Franchise Assets [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Franchise asset impairment charges | 0 | $ 900,000 | $ 2,200,000
Accounting Standards Update 2015-17 [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Noncurrent deferred tax asset included in other assets | 2,400,000 |  |
Net long-term deferred tax liability | $ 76,400,000 |  |
Dealership [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of dealership that is accounted for under the equity method | 50.00% |  |
Franchised Dealerships [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of stores | Store | 107 |  |
Echo Park [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of stores | Store | 5 |  |

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