Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 07, 2019	Jul. 31, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jun. 30, 2019
Business Acquisition [Line Items]
Payments to acquire businesses, net				$ 642,468
Goodwill			$ 2,278,066	2,278,066		$ 2,128,776
Proceeds from divestitures of businesses				416,784	$ 0
Grupo Auto Todo
Business Acquisition [Line Items]
Revenue of disposed entity						93,000
Realized currency losses				27,037
Proceeds from divestitures of businesses	$ 12,028
EIS, Inc.
Business Acquisition [Line Items]
Revenue of disposed entity				588,031		$ 817,249
Realized currency losses			7,664	7,664
Proceeds from divestitures of businesses				365,876
Inenco Group
Business Acquisition [Line Items]
Ownership percentage							35.00%
Inenco Group
Business Acquisition [Line Items]
Percentage of voting interests acquired		65.00%
Estimated annual revenues of acquiree		$ 400,000
Fair value of 35% investment in Inenco held prior to business combination		123,385
Remeasurement gain		38,663
Consideration transferred		765,853
Cash acquired from acquisition		12,149
Intangible assets			318,301	318,301
Goodwill			$ 332,979	$ 332,979
Inenco Group | Automotive Parts
Business Acquisition [Line Items]
Goodwill		174,048
Inenco Group | Industrial Parts
Business Acquisition [Line Items]
Goodwill		$ 158,931
Inenco Group | Weighted Average
Business Acquisition [Line Items]
Useful life		17 years 2 months 12 days
Inenco Group | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 281,804
Useful life		16 years 9 months 18 days
Inenco Group | Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 34,207
Useful life		21 years 3 months 18 days
Inenco Group | Other Intangible Assets
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 2,290
Useful life		5 years