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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Total revenues $ 3,096,537 $ 2,467,036 $ 5,756,216 $ 4,703,137
Income before income taxes 80,752 87,836 150,549 169,099
Depreciation and amortization     (35,675) (26,770)
Other interest expense, net (13,829) (7,169) (25,635) (13,840)
Other income, net 1,659 387 3,033 10,232
Operating segments        
Segment Reporting Information [Line Items]        
Total revenues 3,095,328 2,469,351 5,752,873 4,704,385
Income before income taxes 70,728 70,410 126,254 122,737
Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 1,095,068 954,949 2,065,685 1,854,707
Income before income taxes 28,545 27,857 54,163 53,299
Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 1,322,730 1,095,239 2,493,163 2,066,711
Income before income taxes 30,244 32,238 53,265 54,411
Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 677,530 419,163 1,194,025 782,967
Income before income taxes 11,939 10,315 18,826 15,027
Corporate and other        
Segment Reporting Information [Line Items]        
Total revenues 1,209 (2,315) 3,343 (1,248)
Income before income taxes 41,015 38,239 82,572 76,740
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (18,821) (14,031) (35,675) (26,770)
Other interest expense, net (13,829) (7,169) (25,635) (13,840)
Other income, net 1,659 387 3,033 10,232
New vehicle        
Segment Reporting Information [Line Items]        
Total revenues 1,726,803 1,384,055 3,181,528 2,594,359
New vehicle | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 597,596 528,649 1,111,125 1,013,906
New vehicle | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 771,987 643,404 1,439,590 1,195,286
New vehicle | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 361,913 220,388 640,434 396,705
Used vehicle retail        
Segment Reporting Information [Line Items]        
Total revenues 804,098 633,635 1,519,672 1,235,858
Used vehicle retail | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 283,408 251,214 548,235 496,212
Used vehicle retail | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 335,629 269,512 643,317 516,788
Used vehicle retail | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 184,941 112,032 327,845 222,637
Used vehicle wholesale        
Segment Reporting Information [Line Items]        
Total revenues 85,335 69,512 161,290 141,015
Used vehicle wholesale | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 33,913 30,700 67,519 62,986
Used vehicle wholesale | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 30,983 27,283 59,178 54,120
Used vehicle wholesale | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 20,263 11,473 34,463 23,696
Finance and insurance        
Segment Reporting Information [Line Items]        
Total revenues 114,492 94,851 220,997 181,628
Finance and insurance | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 43,083 37,354 83,083 73,562
Finance and insurance | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 54,866 45,282 106,562 85,855
Finance and insurance | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 15,934 9,525 28,185 17,519
Service, body and parts        
Segment Reporting Information [Line Items]        
Total revenues 311,407 246,005 597,104 478,579
Service, body and parts | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 113,472 96,515 220,614 189,917
Service, body and parts | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 116,386 96,964 226,041 185,626
Service, body and parts | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 76,883 50,326 141,676 98,358
Fleet and other        
Segment Reporting Information [Line Items]        
Total revenues 54,402 38,978 75,625 71,698
Fleet and other | Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 23,596 10,517 35,109 18,124
Fleet and other | Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 12,879 12,794 18,475 29,036
Fleet and other | Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues $ 17,596 $ 15,419 $ 21,422 $ 24,052