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Related Party Transactions - Joint ventures (Details) - item | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2016 | Sep. 30, 2016
Audi, Mercedes-Benz, Sprinter, Porsche, Smart | Fairfield, Connecticut |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity |  |  |  | 80.00% |
Audi, Mercedes-Benz, Sprinter, Porsche, Smart | Fairfield, Connecticut | Lucio A. Noto |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage in joint venture |  |  |  | 20.00% |
Mercedes-Benz | Greenwich, Connecticut |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity |  |  |  | 80.00% |
Mercedes-Benz | Greenwich, Connecticut | Lucio A. Noto |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage in joint venture |  |  |  | 20.00% |
BMW, MINI, Maserati, Porsche, Audi, Land Rover, Volvo and Nissan | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity | 84.00% |  |  | 84.00% | 70.00%
Audi, Maserati, SEAT, Skoda, Volkswagen | Aachen, Germany |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of Consolidated Entity |  |  |  | 68.00% |
Additional ownership percentage acquired |  | 8.00% | 10.00% |  |
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 |  |  |  | 33.00% |
Penske Vehicle Services |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of equity method investment |  |  |  | 31.00% |
PTL |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of equity method investment |  |  |  | 23.40% |
National Powersport Auctions |  |  |  |  |
Related party transactions |  |  |  |  |
Ownership percentage of equity method investment |  |  |  | 7.00% |
Retail Automotive Dealership |  |  |  |  |
Related party transactions |  |  |  |  |
Number of acquired franchises |  |  |  | 20 |
Retail Automotive Dealership | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Number of acquired franchises | 7 |  |  |  |
Retail Automotive Dealership | Porsche Dealership | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Number of acquired franchises | 3 |  |  |  |
Retail Automotive Dealership | Audi Dealership | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Number of acquired franchises | 1 |  |  |  |
Retail Automotive Dealership | Land Rover Dealership | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Number of acquired franchises | 1 |  |  |  |
Retail Automotive Dealership | Volvo Dealership | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Number of acquired franchises | 1 |  |  |  |
Retail Automotive Dealership | Nissan Dealership | Northern Italy |  |  |  |  |
Related party transactions |  |  |  |  |
Number of acquired franchises | 1 |  |  |  |

X
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