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Revenue - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 2,808,376 | $ 2,860,026
U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,062,782 | 2,088,486
U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 642,158 | 660,542
Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 103,436 | 110,998
Total new and used vehicle sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,325,826 | 2,398,189
Total new and used vehicle sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,668,987 | 1,707,785
Total new and used vehicle sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 567,393 | 593,138
Total new and used vehicle sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 89,446 | 97,266
New vehicle retail sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,414,485 | 1,513,590
New vehicle retail sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,031,742 | 1,089,953
New vehicle retail sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 318,571 | 354,404
New vehicle retail sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 64,172 | 69,233
Used vehicle retail sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 819,203 | 780,570
Used vehicle retail sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 594,418 | 563,830
Used vehicle retail sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 203,561 | 192,549
Used vehicle retail sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 21,224 | 24,191
Used vehicle wholesale sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 92,138 | 104,029
Used vehicle wholesale sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 42,827 | 54,002
Used vehicle wholesale sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 45,261 | 46,185
Used vehicle wholesale sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,050 | 3,842
Parts and service sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 369,174 | 349,515
Parts and service sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 297,602 | 284,514
Parts and service sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 59,566 | 53,141
Parts and service sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 12,006 | 11,860
Vehicle parts sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 86,661 | 85,196
Vehicle parts sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 74,478 | 74,355
Vehicle parts sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,602 | 9,515
Vehicle parts sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,581 | 1,326
Maintenance and repair sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 282,513 | 264,319
Maintenance and repair sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 223,124 | 210,159
Maintenance and repair sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 48,964 | 43,626
Maintenance and repair sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,425 | 10,534
Finance, insurance and other, net |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 113,376 | 112,322
Finance, insurance and other, net | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 96,193 | 96,187
Finance, insurance and other, net | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 15,199 | 14,263
Finance, insurance and other, net | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 1,984 | $ 1,872

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