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Revenues - Revenues Disaggregated by Revenue Source and Geographical Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 2,908,812	$ 2,889,058	$ 2,943,462	$ 2,860,026	$ 2,920,405	$ 3,012,292	$ 2,672,195	$ 2,518,829	$ 11,601,358	$ 11,123,721	$ 10,887,612
U.S.
Disaggregation of Revenue [Line Items]
Revenues									8,723,257	8,680,565	8,734,672
U.K.
Disaggregation of Revenue [Line Items]
Revenues									2,437,385	1,986,003	1,723,155
Brazil
Disaggregation of Revenue [Line Items]
Revenues									440,716	457,153	429,785
Total new and used vehicle sales
Disaggregation of Revenue [Line Items]
Revenues									9,717,016	9,356,687	9,205,651
Total new and used vehicle sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues									7,168,729	7,180,231	7,285,265
Total new and used vehicle sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues									2,162,637	1,775,725	1,543,488
Total new and used vehicle sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues									385,650	400,731	376,898
New vehicle retail sales
Disaggregation of Revenue [Line Items]
Revenues									6,181,371	6,157,531	6,046,075
New vehicle retail sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues									4,682,820	4,768,864	4,766,047
New vehicle retail sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues									1,217,135	1,092,612	987,538
New vehicle retail sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues									281,416	296,055	292,490
Used vehicle retail sales
Disaggregation of Revenue [Line Items]
Revenues									3,166,070	2,798,986	2,757,713
Used vehicle retail sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues									2,306,999	2,160,699	2,242,508
Used vehicle retail sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues									771,719	546,266	434,203
Used vehicle retail sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues									87,352	92,021	81,002
Used vehicle wholesale sales
Disaggregation of Revenue [Line Items]
Revenues									369,575	400,170	401,863
Used vehicle wholesale sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues									178,910	250,668	276,710
Used vehicle wholesale sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues									173,783	136,847	121,747
Used vehicle wholesale sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues									16,882	12,655	3,406
Parts and service sales
Disaggregation of Revenue [Line Items]
Revenues									1,416,889	1,338,032	1,261,307
Parts and service sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues									1,153,257	1,124,380	1,071,651
Parts and service sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues									217,594	165,755	143,362
Parts and service sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues									46,038	47,897	46,294
Vehicle parts sales
Disaggregation of Revenue [Line Items]
Revenues									340,456	316,850	302,117
Vehicle parts sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues									296,027	282,744	268,919
Vehicle parts sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues									39,146	28,206	24,602
Vehicle parts sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues									5,283	5,900	8,596
Maintenance and repair sales
Disaggregation of Revenue [Line Items]
Revenues									1,076,433	1,021,182	959,190
Maintenance and repair sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues									857,230	841,636	802,732
Maintenance and repair sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues									178,448	137,549	118,760
Maintenance and repair sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues									40,755	41,997	37,698
Finance, insurance and other, net
Disaggregation of Revenue [Line Items]
Revenues									467,453	429,002	420,654
Finance, insurance and other, net | U.S.
Disaggregation of Revenue [Line Items]
Revenues									401,271	375,954	377,756
Finance, insurance and other, net | U.K.
Disaggregation of Revenue [Line Items]
Revenues									57,154	44,523	36,305
Finance, insurance and other, net | Brazil
Disaggregation of Revenue [Line Items]
Revenues									$ 9,028	$ 8,525	$ 6,593

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