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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 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	$ 49,835	$ (44,586)	115,205	44,796
Amounts reclassified from accumulated other comprehensive loss	545	945	1,067	1,471
Total other comprehensive income (loss), net of tax	50,380	(43,641)	116,272	46,267
Other comprehensive income attributable to noncontrolling interests	(232)	(152)	(693)	(435)
Ending Balance	3,899,791	3,306,346	3,899,791	3,306,346
Foreign Currency Translation
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(405,527)	(365,291)	(484,121)	(463,914)
Other comprehensive income (loss), before reclassifications	64,069	(51,193)	143,124	47,713
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive income (loss), net of tax	64,069	(51,193)	143,124	47,713
Other comprehensive income attributable to noncontrolling interests	(232)	(152)	(693)	(435)
Ending Balance	(341,690)	(416,636)	(341,690)	(416,636)
Pension and Postretirement Benefits
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	69	(757)	76	(758)
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	16	419	9	420
Total other comprehensive income (loss), net of tax	16	419	9	420
Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Ending Balance	85	(338)	85	(338)
Net Investment Hedge
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	74,693	52,721	88,378	62,245
Other comprehensive income (loss), before reclassifications	(14,234)	6,607	(27,919)	(2,917)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive income (loss), net of tax	(14,234)	6,607	(27,919)	(2,917)
Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Ending Balance	60,459	59,328	60,459	59,328
Interest Rate Swap
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(16,216)	(18,336)	(16,745)	(18,861)
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	529	526	1,058	1,051
Total other comprehensive income (loss), net of tax	529	526	1,058	1,051
Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Ending Balance	(15,687)	(17,810)	(15,687)	(17,810)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(346,981)	(331,663)	(412,412)	(421,288)
Total other comprehensive income (loss), net of tax			115,579	45,832
Ending Balance	$ (296,833)	$ (375,456)	$ (296,833)	$ (375,456)