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Revenue - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 3,005,689	$ 2,943,462	$ 5,814,065	$ 5,803,488
U.S.
Disaggregation of Revenue [Line Items]
Revenues	2,278,680	2,168,001	4,341,462	4,256,487
U.K.
Disaggregation of Revenue [Line Items]
Revenues	614,434	666,883	1,256,592	1,327,425
Brazil
Disaggregation of Revenue [Line Items]
Revenues	112,575	108,578	216,011	219,576
Total new and used vehicle sales
Disaggregation of Revenue [Line Items]
Revenues	2,500,267	2,470,277	4,826,093	4,868,466
Total new and used vehicle sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues	1,858,529	1,781,670	3,527,516	3,489,455
Total new and used vehicle sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues	543,113	593,270	1,110,506	1,186,408
Total new and used vehicle sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues	98,625	95,337	188,071	192,603
New vehicle retail sales
Disaggregation of Revenue [Line Items]
Revenues	1,565,375	1,555,570	2,979,860	3,069,160
New vehicle retail sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues	1,188,792	1,146,882	2,220,534	2,236,835
New vehicle retail sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues	302,224	338,635	620,795	693,039
New vehicle retail sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues	74,359	70,053	138,531	139,286
Used vehicle retail sales
Disaggregation of Revenue [Line Items]
Revenues	838,896	821,853	1,658,099	1,602,423
Used vehicle retail sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues	625,452	592,007	1,219,870	1,155,837
Used vehicle retail sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues	194,007	208,108	397,568	400,657
Used vehicle retail sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues	19,437	21,738	40,661	45,929
Used vehicle wholesale sales
Disaggregation of Revenue [Line Items]
Revenues	95,996	92,854	188,134	196,883
Used vehicle wholesale sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues	44,285	42,781	87,112	96,783
Used vehicle wholesale sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues	46,882	46,527	92,143	92,712
Used vehicle wholesale sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues	4,829	3,546	8,879	7,388
Parts and service sales
Disaggregation of Revenue [Line Items]
Revenues	378,167	358,129	747,341	707,644
Parts and service sales | U.S.
Disaggregation of Revenue [Line Items]
Revenues	309,645	288,889	607,247	573,403
Parts and service sales | U.K.
Disaggregation of Revenue [Line Items]
Revenues	56,360	57,996	115,926	111,137
Parts and service sales | Brazil
Disaggregation of Revenue [Line Items]
Revenues	12,162	11,244	24,168	23,104
Finance, insurance and other, net
Disaggregation of Revenue [Line Items]
Revenues	127,255	115,056	240,631	227,378
Variable consideration recognized relating to performance obligations satisfied in previous period	9,000	2,200	12,200	5,700
Finance, insurance and other, net | U.S.
Disaggregation of Revenue [Line Items]
Revenues	110,506	97,442	206,699	193,629
Finance, insurance and other, net | U.K.
Disaggregation of Revenue [Line Items]
Revenues	14,961	15,617	30,160	29,880
Finance, insurance and other, net | Brazil
Disaggregation of Revenue [Line Items]
Revenues	$ 1,788	$ 1,997	$ 3,772	$ 3,869

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- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12A
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 4
-Subparagraph (a)
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