Accumulated Other Comprehensive (Loss) Income - Amount of Income Tax (Expense) Benefit Allocated to Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity [Abstract]
Foreign Currency Translation, Other comprehensive income (loss), before tax	$ 56,156	$ 47,787	$ 200,366	$ 96,326
Foreign Currency Translation, Income tax (expense) benefit	23	(75)	(1,063)	(901)
Foreign currency translation, Other comprehensive income (loss), net of tax	56,179	47,712	199,303	95,425
Pension and Postretirement Benefits, Other comprehensive income (loss), before tax	0	209	10	635
Pension and Postretirement Benefits, Income tax (expense) benefit	(7)	(3)	(8)	(9)
Pension and Postretirement Benefits, Other comprehensive income (loss), net of tax	(7)	206	2	626
Net investment hedge, Other comprehensive income (loss), before tax	(15,266)	(11,740)	(59,292)	(16,371)
Net investment hedge, Income tax (expense) benefit	5,585	4,345	21,692	6,059
Net investment hedge, Other comprehensive income (loss), net of tax	(9,681)	(7,395)	(37,600)	(10,312)
Interest rate swap, Other comprehensive income (loss), before tax	834	834	2,502	2,502
Interest rate swap, Income tax benefit (expense) benefit	(305)	(309)	(915)	(926)
Interest rate swap, Other comprehensive income (loss), net of tax	$ 529	$ 525	$ 1,587	$ 1,576