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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance			$ 3,942,604	$ 3,401,313
Other comprehensive income (loss), before reclassifications	$ 46,498	$ 40,317	161,703	85,113
Amounts reclassified from accumulated other comprehensive loss	522	731	1,589	2,202
Total other comprehensive income (loss), net of tax	47,020	41,048	163,292	87,315
Other comprehensive income attributable to noncontrolling interests	(130)	(23)	(823)	(458)
Ending Balance	4,039,572	3,451,433	4,039,572	3,451,433
Foreign Currency Translation
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(341,690)	(416,636)	(484,121)	(463,914)
Other comprehensive income (loss), before reclassifications	56,179	47,712	199,303	95,425
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive income (loss), net of tax	56,179	47,712	199,303	95,425
Other comprehensive income attributable to noncontrolling interests	(130)	(23)	(823)	(458)
Ending Balance	(285,641)	(368,947)	(285,641)	(368,947)
Pension and Postretirement Benefits
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	85	(338)	76	(758)
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	(7)	206	2	626
Total other comprehensive income (loss), net of tax	(7)	206	2	626
Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Ending Balance	78	(132)	78	(132)
Net Investment Hedge
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	60,459	59,328	88,378	62,245
Other comprehensive income (loss), before reclassifications	(9,681)	(7,395)	(37,600)	(10,312)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive income (loss), net of tax	(9,681)	(7,395)	(37,600)	(10,312)
Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Ending Balance	50,778	51,933	50,778	51,933
Interest Rate Swap
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(15,687)	(17,810)	(16,745)	(18,861)
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	529	525	1,587	1,576
Total other comprehensive income (loss), net of tax	529	525	1,587	1,576
Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Ending Balance	(15,158)	(17,285)	(15,158)	(17,285)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(296,833)	(375,456)	(412,412)	(421,288)
Total other comprehensive income (loss), net of tax			162,469	86,857
Ending Balance	$ (249,943)	$ (334,431)	$ (249,943)	$ (334,431)