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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Total revenues $ 3,091,952 $ 2,680,342 $ 8,848,168 $ 7,383,479
Income before income taxes 108,987 86,543 259,536 255,642
Depreciation and amortization     (55,324) (41,598)
Other interest expense (15,010) (9,905) (40,645) (23,745)
Other income, net 2,389 1,125 5,422 11,357
Operating segments        
Segment Reporting Information [Line Items]        
Total revenues 3,087,102 2,681,783 8,839,974 7,386,169
Income before income taxes 74,358 75,610 200,610 198,347
Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 1,097,854 1,008,310 3,163,539 2,863,018
Income before income taxes 25,304 31,141 79,466 84,440
Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 1,336,361 1,209,955 3,829,524 3,276,667
Income before income taxes 37,369 36,954 90,634 91,365
Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 652,887 463,518 1,846,911 1,246,484
Income before income taxes 11,685 7,515 30,510 22,542
Corporate and other        
Segment Reporting Information [Line Items]        
Total revenues 4,850 (1,441) 8,194 (2,690)
Income before income taxes 66,899 34,541 149,473 111,281
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (19,649) (14,828) (55,324) (41,598)
Other interest expense (15,010) (9,905) (40,645) (23,745)
Other income, net 2,389 1,125 5,422 11,357
New vehicle        
Segment Reporting Information [Line Items]        
Total revenues 1,732,950 1,553,511 4,914,478 4,147,870
New vehicle | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 600,054 567,423 1,711,179 1,581,329
New vehicle | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 787,803 737,931 2,227,393 1,933,217
New vehicle | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 347,568 252,861 988,002 649,566
Used vehicle retail        
Segment Reporting Information [Line Items]        
Total revenues 805,928 679,180 2,325,600 1,915,038
Used vehicle retail | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 288,238 260,622 836,473 756,834
Used vehicle retail | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 334,614 289,723 977,931 806,510
Used vehicle retail | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 182,479 128,355 510,323 350,992
Used vehicle wholesale        
Segment Reporting Information [Line Items]        
Total revenues 91,956 65,739 253,246 206,754
Used vehicle wholesale | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 36,983 27,986 104,502 90,972
Used vehicle wholesale | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 35,162 24,337 94,340 78,456
Used vehicle wholesale | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 19,896 13,418 54,359 37,114
Finance and insurance        
Segment Reporting Information [Line Items]        
Total revenues 121,062 101,044 342,059 282,672
Finance and insurance | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 42,541 38,408 125,626 111,970
Finance and insurance | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 60,494 51,564 167,057 137,419
Finance and insurance | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 16,421 10,816 44,606 28,335
Service, body and parts        
Segment Reporting Information [Line Items]        
Total revenues 311,327 265,683 908,431 744,262
Service, body and parts | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 114,756 103,070 335,370 292,987
Service, body and parts | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 114,776 104,106 340,816 289,733
Service, body and parts | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 76,906 56,240 218,582 154,598
Fleet and other        
Segment Reporting Information [Line Items]        
Total revenues 28,729 15,185 104,354 86,883
Fleet and other | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 15,282 10,801 50,389 28,926
Fleet and other | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 3,512 2,294 21,987 31,332
Fleet and other | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues $ 9,617 $ 1,828 $ 31,039 $ 25,879