Segment Information - Disaggregated Geographical Revenue by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 4,736,833	$ 4,586,294
North America [Member]
Disaggregation of Revenue [Line Items]
Net sales	3,928,273	3,804,349
Automotive Parts [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,813,785	1,782,314
Automotive Parts [Member] | Australasia [Member]
Disaggregation of Revenue [Line Items]
Net sales	284,553	302,004
Automotive Parts [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	524,007	479,941
Industrial Parts [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,635,423	1,547,944
Business Products [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 479,065	$ 474,091