Intangible Assets - Activity (Details)	9 Months Ended
	Sep. 30, 2019 item
Retail Automotive Dealership
Intangible assets
Number of franchises sold	8
Number of franchises terminated	5
Commercial Vehicle Distribution
Intangible assets
Number of dealerships acquired	1
Retail Commercial Truck Dealership
Intangible assets
Number of retail locations acquired	6