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Related Party Transactions - Joint ventures (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 06, 2017 | Jul. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Lexus Toyota Volkswagen | Frankfurt, Germany |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of equity method investment |  |  |  | 50.00% |
BMW, MINI | Barcelona Spain |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of equity method investment |  |  |  | 50.00% |
BMW, MINI, Rolls-Royce, Ferrari and ALPINA | Tokyo, Japan |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of equity method investment |  |  |  | 49.00% |
Penske Commercial Leasing Australia |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of equity method investment |  |  |  | 28.00% |
Audi, Mercedes-Benz, Sprinter, Porsche | Fairfield, Connecticut |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity |  |  |  | 80.00% |
Mercedes-Benz | Greenwich, Connecticut |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity |  |  |  | 80.00% |
BMW, MINI, Maserati, Porsche, Audi, Land Rover, Volvo, Mercedes-Benz, smart and Lamborghini | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity |  |  |  | 84.00% |
Audi, Maserati, SEAT, Skoda, Volkswagen | Aachen, Germany |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity |  |  |  | 79.35% | 68.00%
Additional ownership percentage acquired |  |  |  | 11.40% |
PTL |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 23.40% | 23.40% | 9.00% | 28.90% |

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