Schedule of Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Segment Reporting Information
Receivables, net	$ 1,255,876	$ 1,065,617	$ 1,027,106
Inventories	2,794,894		2,380,783
Property, plant and equipment, net	1,201,003		913,089
Equity method investments	157,409		208,404
Other unallocated assets	6,176,154		4,837,490
Total assets	11,585,336		9,366,872
North America
Segment Reporting Information
Receivables, net	437,429		379,666
Inventories	1,058,310		1,076,393
Property, plant and equipment, net	560,918		537,286
Equity method investments	16,075		336
Europe
Segment Reporting Information
Receivables, net	696,106		555,372
Inventories	1,391,578		964,068
Property, plant and equipment, net	554,550		293,539
Equity method investments	141,334		208,068
Specialty
Segment Reporting Information
Receivables, net	122,341		92,068
Inventories	345,006		340,322
Property, plant and equipment, net	$ 85,535		$ 82,264