Segment Information - Revenue and Long-Lived Assets by Geography (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segments	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Reportable Segments | segments									4
Revenue	$ 2,017,438	$ 2,006,275	$ 1,993,351	$ 1,813,372	$ 1,777,961	$ 1,707,763	$ 1,686,345	$ 1,622,273	$ 7,830,436	$ 6,794,342	$ 6,956,311
Property, Plant and Equipment, Net	999,772				945,670				999,772	945,670
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									4,424,030	3,910,733	4,270,061
Property, Plant and Equipment, Net	658,109				640,802				658,109	640,802
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,504,798	1,261,232	1,059,413
Property, Plant and Equipment, Net	238,942				211,238				238,942	211,238
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									735,368	594,838	637,533
Property, Plant and Equipment, Net	40,334				28,288				40,334	28,288
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									774,918	675,995	626,761
Property, Plant and Equipment, Net	57,016				56,614				57,016	56,614
Other Geographical Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									391,322	351,544	$ 362,543
Property, Plant and Equipment, Net	$ 5,371				$ 8,728				$ 5,371	$ 8,728