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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
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)