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Segment Information Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
New vehicle retail sales |  |  |  |  |  |  |  |  | $ 6,157,531 | $ 6,046,075 | $ 6,001,306
Used vehicle retail sales |  |  |  |  |  |  |  |  | 2,798,986 | 2,757,713 | 2,638,969
Used vehicle wholesale sales |  |  |  |  |  |  |  |  | 400,170 | 401,863 | 397,251
Parts and service |  |  |  |  |  |  |  |  | 1,338,032 | 1,261,307 | 1,186,193
Finance and insurance |  |  |  |  |  |  |  |  | 429,002 | 420,654 | 408,786
Total revenues | $ 2,920,405 | $ 3,012,292 | $ 2,672,195 | $ 2,518,829 | $ 2,673,632 | $ 2,823,176 | $ 2,782,449 | $ 2,608,355 | 11,123,721 | 10,887,612 | 10,632,505
Gross profit | 425,675 | 431,420 | $ 404,892 | $ 383,522 | 389,181 | 406,668 | 410,119 | 389,101 | 1,645,509 | 1,595,069 | 1,533,972
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 1,226,195 | 1,170,763 | 1,120,833
Depreciation and amortization |  |  |  |  |  |  |  |  | 57,936 | 51,234 | 47,239
ASSET IMPAIRMENTS | 10,000 | $ 9,500 |  |  | 20,000 | $ 10,900 | $ 1,000 | $ 900 | 19,506 | 32,838 | 87,562
Floorplan interest expense |  |  |  |  |  |  |  |  | (52,372) | (44,927) | (39,264)
Other interest expense, net |  |  |  |  |  |  |  |  | (70,497) | (67,936) | (56,903)
Income before income taxes |  |  |  |  |  |  |  |  | 219,003 | 227,371 | 182,171
Provision for income taxes |  |  |  |  |  |  |  |  | (5,561) | (80,306) | (88,172)
Net income |  |  |  |  |  |  |  |  | 213,442 | 147,065 | 93,999
Capital expenditures |  |  |  |  |  |  |  |  | 98,301 | 100,606 | 107,232
Total assets | 4,871,065 |  |  |  | 4,461,903 |  |  |  | 4,871,065 | 4,461,903 |
U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
New vehicle retail sales |  |  |  |  |  |  |  |  | 4,768,864 | 4,766,047 | 4,989,290
Used vehicle retail sales |  |  |  |  |  |  |  |  | 2,160,699 | 2,242,508 | 2,204,728
Used vehicle wholesale sales |  |  |  |  |  |  |  |  | 250,668 | 276,710 | 289,580
Parts and service |  |  |  |  |  |  |  |  | 1,124,380 | 1,071,651 | 1,032,960
Finance and insurance |  |  |  |  |  |  |  |  | 375,954 | 377,756 | 377,432
Total revenues |  |  |  |  |  |  |  |  | 8,680,565 | 8,734,672 | 8,893,990
Gross profit |  |  |  |  |  |  |  |  | 1,365,314 | 1,355,349 | 1,338,947
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 983,974 | 965,139 | 958,608
Depreciation and amortization |  |  |  |  |  |  |  |  | 48,285 | 43,472 | 41,220
ASSET IMPAIRMENTS |  |  |  |  |  |  |  |  | 12,762 | 21,794 | 18,983
Floorplan interest expense |  |  |  |  |  |  |  |  | (47,221) | (40,444) | (36,062)
Other interest expense, net |  |  |  |  |  |  |  |  | (66,493) | (62,320) | (52,277)
Income before income taxes |  |  |  |  |  |  |  |  | 206,579 | 222,180 | 231,797
Provision for income taxes |  |  |  |  |  |  |  |  | (5,679) | (82,541) | (89,433)
Net income |  |  |  |  |  |  |  |  | 200,900 | 139,639 | 142,364
Capital expenditures |  |  |  |  |  |  |  |  | 77,477 | 86,692 | 97,504
Goodwill and intangible franchise rights | 1,091,248 |  |  |  | 1,066,469 |  |  |  | 1,091,248 | 1,066,469 |
Total assets | 4,087,039 |  |  |  | 3,855,701 |  |  |  | 4,087,039 | 3,855,701 |
U.K. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
New vehicle retail sales |  |  |  |  |  |  |  |  | 1,092,612 | 987,538 | 641,888
Used vehicle retail sales |  |  |  |  |  |  |  |  | 546,266 | 434,203 | 351,311
Used vehicle wholesale sales |  |  |  |  |  |  |  |  | 136,847 | 121,747 | 100,706
Parts and service |  |  |  |  |  |  |  |  | 165,755 | 143,362 | 102,183
Finance and insurance |  |  |  |  |  |  |  |  | 44,523 | 36,305 | 24,117
Total revenues |  |  |  |  |  |  |  |  | 1,986,003 | 1,723,155 | 1,220,205
Gross profit |  |  |  |  |  |  |  |  | 225,253 | 192,982 | 137,646
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 191,570 | 158,636 | 108,719
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,198 | 6,594 | 4,307
ASSET IMPAIRMENTS |  |  |  |  |  |  |  |  | 0 | 201 | 330
Floorplan interest expense |  |  |  |  |  |  |  |  | (4,727) | (4,222) | (2,276)
Other interest expense, net |  |  |  |  |  |  |  |  | (3,664) | (5,197) | (3,135)
Income before income taxes |  |  |  |  |  |  |  |  | 17,094 | 18,132 | 18,879
Provision for income taxes |  |  |  |  |  |  |  |  | (2,142) | (3,697) | (3,655)
Net income |  |  |  |  |  |  |  |  | 14,952 | 14,435 | 15,224
Capital expenditures |  |  |  |  |  |  |  |  | 19,944 | 12,602 | 9,395
Goodwill and intangible franchise rights | 94,517 |  |  |  | 74,391 |  |  |  | 94,517 | 74,391 |
Total assets | 654,154 |  |  |  | 482,937 |  |  |  | 654,154 | 482,937 |
Brazil |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
New vehicle retail sales |  |  |  |  |  |  |  |  | 296,055 | 292,490 | 370,128
Used vehicle retail sales |  |  |  |  |  |  |  |  | 92,021 | 81,002 | 82,930
Used vehicle wholesale sales |  |  |  |  |  |  |  |  | 12,655 | 3,406 | 6,965
Parts and service |  |  |  |  |  |  |  |  | 47,897 | 46,294 | 51,050
Finance and insurance |  |  |  |  |  |  |  |  | 8,525 | 6,593 | 7,237
Total revenues |  |  |  |  |  |  |  |  | 457,153 | 429,785 | 518,310
Gross profit |  |  |  |  |  |  |  |  | 54,942 | 46,738 | 57,379
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 50,651 | 46,988 | 53,506
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,453 | 1,168 | 1,712
ASSET IMPAIRMENTS |  |  |  |  |  |  |  |  | 6,744 | 10,843 | 68,249
Floorplan interest expense |  |  |  |  |  |  |  |  | (424) | (261) | (926)
Other interest expense, net |  |  |  |  |  |  |  |  | (340) | (419) | (1,491)
Income before income taxes |  |  |  |  |  |  |  |  | (4,670) | (12,941) | (68,505)
Provision for income taxes |  |  |  |  |  |  |  |  | 2,260 | 5,932 | 4,916
Net income |  |  |  |  |  |  |  |  | (2,410) | (7,009) | (63,589)
Capital expenditures |  |  |  |  |  |  |  |  | 880 | 1,312 | 333
Goodwill and intangible franchise rights | 12,901 |  |  |  | 20,779 |  |  |  | 12,901 | 20,779 |
Total assets | 129,872 |  |  |  | 123,265 |  |  |  | 129,872 | 123,265 |
Consolidated Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangible franchise rights | 1,198,666 |  |  |  | 1,161,639 |  |  |  | 1,198,666 | 1,161,639 |
Total assets | $ 4,871,065 |  |  |  | $ 4,461,903 |  |  |  | 4,871,065 | 4,461,903 |
Net of taxes [Member] | U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
ASSET IMPAIRMENTS |  |  |  |  |  |  |  |  | 8,000 | 13,500 | 12,000
Net of taxes [Member] | Brazil |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
ASSET IMPAIRMENTS |  |  |  |  |  |  |  |  | $ 4,400 | $ 6,900 | $ 62,400

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