ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications From Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Amount Reclassified from Accumulated Other Comprehensive Income
Interest expense	$ (7,175)	$ (8,734)	$ (14,590)	$ (17,122)
Miscellaneous, net	(2,028)	(923)	(2,991)	(2,335)
Income before Income Taxes	74,294	60,668	175,182	138,704
Tax benefit	(19,020)	(18,808)	(35,969)	(41,594)
Net Income Attributable to AptarGroup, Inc.	55,276	41,839	139,228	97,092
Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Net Income Attributable to AptarGroup, Inc.	3,670	3,975	1,516	2,068
Defined Benefit Pension Plans | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Amortization of net loss	3,092	1,808	6,184	3,870
Amortization of prior service cost	44	95	89	192
Income before Income Taxes	3,136	1,903	6,273	4,062
Tax benefit	(750)	(463)	(1,500)	(986)
Net Income Attributable to AptarGroup, Inc.	2,386	1,440	4,773	3,076
Derivatives | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Net Income Attributable to AptarGroup, Inc.	1,284	2,535	(3,257)	(1,008)
Derivatives | Changes in cross currency swap: interest component | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Interest expense	(6)	(525)	(18)	(1,288)
Derivatives | Changes in cross currency swap: foreign exchange component | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Miscellaneous, net	$ 1,290	$ 3,060	$ (3,239)	$ 280