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Summary of Significant Accounting Policies and Estimates - Impact of Applying Topic 606 on the Consolidated Income Statement (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
Revenue, Initial Application Period Cumulative Effect Transition [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
Cost of sales									9,876,265	9,478,212	9,292,543
Selling, general and administrative expenses									1,273,057	1,226,195	1,170,763
Provision for income taxes									47,631	5,561	80,306
Net income (loss)	$ 30,718	$ 34,777	$ 56,463	$ 35,814	$ 110,489	$ 29,881	$ 39,133	$ 33,939	157,772	213,442	147,065
Balances Without Adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Selling, general and administrative expenses									1,273,131
Provision for income taxes									46,383
Net income (loss)									153,754
ASU 2014-09 | Effect of Change Higher (Lower)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Selling, general and administrative expenses									(74)
Provision for income taxes									1,248
Net income (loss)									4,018
Parts and service sales
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									1,416,889	1,338,032	1,261,307
Cost of sales									657,741	618,343	581,307
Parts and service sales | Balances Without Adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									1,417,584
Cost of sales									657,886
Parts and service sales | ASU 2014-09 | Effect of Change Higher (Lower)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									(695)
Cost of sales									(145)
Finance, insurance and other, net
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									467,453	$ 429,002	$ 420,654
Finance, insurance and other, net | Balances Without Adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									461,711
Finance, insurance and other, net | ASU 2014-09 | Effect of Change Higher (Lower)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									$ 5,742

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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