Accumulated Other Comprehensive (Loss) Income - Components and Activity in Accumulated Other Comprehensive (Loss) Income Net of Deferred Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 3,817,696	$ 3,942,604
Other comprehensive income (loss), before reclassifications	50,470	65,370
Amounts reclassified from accumulated other comprehensive loss	645	522
Total other comprehensive income (loss), net of tax	51,115	65,892
Other comprehensive income attributable to noncontrolling interests	(186)	(461)
Ending Balance	3,943,430	3,783,972
Foreign Currency Translation
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(257,569)	(484,121)
Other comprehensive income (loss), before reclassifications	64,891	79,055
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive income (loss), net of tax	64,891	79,055
Other comprehensive income attributable to noncontrolling interests	(186)	(461)
Ending Balance	(192,864)	(405,527)
Pension and Postretirement Benefits
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(21)	76
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	3	(7)
Total other comprehensive income (loss), net of tax	3	(7)
Other comprehensive income attributable to noncontrolling interests	0	0
Ending Balance	(18)	69
Net Investment Hedge
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	46,551	88,378
Other comprehensive income (loss), before reclassifications	(14,421)	(13,685)
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive income (loss), net of tax	(14,421)	(13,685)
Other comprehensive income attributable to noncontrolling interests	0	0
Ending Balance	32,130	74,693
Interest Rate Swap
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(14,629)	(16,745)
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	642	529
Total other comprehensive income (loss), net of tax	642	529
Other comprehensive income attributable to noncontrolling interests	0	0
Ending Balance	(13,987)	(16,216)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(225,668)	(412,412)
Total other comprehensive income (loss), net of tax	50,929	65,431
Ending Balance	$ (174,739)	$ (346,981)