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Goodwill and Other Intangible Assets - Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 8,709,779 | $ 8,549,628
Accumulated Amortization | (2,327,226) | (2,025,853)
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,042,779 | 9,882,628
Trade name |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,333,000 | 1,333,000
Customer-Related Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,908,491 | 6,748,355
Accumulated Amortization | (2,008,075) | (1,749,327)
Dealer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,603,700 | 1,605,910
Accumulated Amortization | (167,404) | (146,299)
Other Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 197,588 | 195,363
Accumulated Amortization | $ (151,747) | $ (130,227)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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