CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 214,090	$ 242,227	$ 194,766
Other Comprehensive Income:
Foreign currency translation adjustments	79,109	(8,727)	(62,914)
Changes in treasury locks, net of tax	0	0	17
Changes in derivative gains (losses), net of tax	315	(37)	1,547
Defined benefit pension plan, net of tax
Actuarial (loss) gain, net of tax	(27,268)	(25,877)	5,292
Prior service cost, net of tax	1,879	320	(26)
Amortization of prior service cost included in net income, net of tax	294	2,541	533
Amortization of net loss included in net income, net of tax	5,920	332	4,991
Total defined benefit pension plan, net of tax	(19,175)	(22,684)	10,790
Total other comprehensive income (loss)	60,249	(31,448)	(50,560)
Comprehensive Income	274,339	210,779	144,206
Comprehensive Income Attributable to Noncontrolling Interests	(60)	(21)	(5)
Comprehensive Income Attributable to AptarGroup, Inc.	$ 274,279	$ 210,758	$ 144,201