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Business Acquisitions and Dispositions - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) store Dealerships | Dec. 31, 2019 USD ($) store | Dec. 31, 2018 USD ($) Dealerships Business store
Business Acquisition [Line Items] |  |  |
Number of franchise dealerships opened |  | 1 |
Number of EchoPark opened | 7 | 3 |
Number of businesses acquired | 2 |  |
Number of franchises disposed |  | 1 | 2
Number of franchises disposed mid-line | 1 | 9 | 5
Cash generated from disposition | $ | $ 9,600 | $ 250,700 | $ 128,700
Number of franchises terminated | Dealerships | 2 |  | 1
Number of dealerships held for sale | 0 |  |
Payments to Acquire Businesses, Gross | $ | $ 19,700 |  |
Number of EchoPark closed | Dealerships |  |  | 4

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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