Fair Value Measurements - Additional Information (Detail) - Stand-Alone Pre-Owned Vehicle Businesses And Related Real Estate [Member] $ in Millions |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
|
Sep. 30, 2016
Business
|
Sep. 30, 2017
USD ($)
Business
|
Sep. 30, 2016
Business
|
|
| Business Acquisition [Line Items] | |||
| Number of businesses acquired | Business | 3 | 3 | |
| Impairment of goodwill | $ | $ 0.9 | ||
| Impairment of property and equipment | $ | $ 0.8 | ||
| Number of businesses closed | Business | 2 | ||
| X | ||||||||||
- Definition Impairment of property and equipment. No definition available.
|
| X | ||||||||||
- Definition Number of business closed. No definition available.
|
| X | ||||||||||
- 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. No definition available.
|
| X | ||||||||||
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of businesses acquired by the entity during the period. No definition available.
|
| X | ||||||||||
- Details
|