Segment Information - Disaggregated Geographical Revenue by Reportable 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]
Net sales	$ 4,934,260	$ 4,822,065	$ 9,671,093	$ 9,408,359
North America
Disaggregation of Revenue [Line Items]
Net sales	4,123,035	4,030,844	8,051,308	7,835,193
Automotive Parts | North America
Disaggregation of Revenue [Line Items]
Net sales	1,963,583	1,944,980	3,777,368	3,727,294
Automotive Parts | Australasia
Disaggregation of Revenue [Line Items]
Net sales	286,717	302,799	571,270	604,803
Automotive Parts | Europe
Disaggregation of Revenue [Line Items]
Net sales	524,508	488,422	1,048,515	968,363
Industrial Parts | North America
Disaggregation of Revenue [Line Items]
Net sales	1,681,721	1,602,665	3,317,144	3,150,609
Business Products | North America
Disaggregation of Revenue [Line Items]
Net sales	$ 477,731	$ 483,199	$ 956,796	$ 957,290