ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amount Reclassified from Accumulated Other Comprehensive Income
Interest expense	$ (8,851)	$ (8,898)	$ (25,973)	$ (26,868)
Miscellaneous, net	(1,040)	(269)	(3,375)	148
Income before Income Taxes	89,139	82,273	227,843	274,373
Tax benefit	(25,404)	(25,504)	(66,998)	(80,684)
Net Income Attributable to AptarGroup, Inc.	63,716	56,750	160,808	193,669
Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Net Income Attributable to AptarGroup, Inc.	7,516	(7,087)	9,584	(10,249)
Defined Benefit Pension Plans | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Amortization of net loss	1,966	846	5,836	2,546
Amortization of prior service cost	101	111	293	337
Income before Income Taxes	2,067	957	6,129	2,883
Tax benefit	(504)	(244)	(1,490)	(733)
Net Income Attributable to AptarGroup, Inc.	1,563	713	4,639	2,150
Derivatives | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Net Income Attributable to AptarGroup, Inc.	5,953	(7,800)	4,945	(12,399)
Derivatives | Changes in cross currency swap: interest component | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Interest expense	(146)	(1,309)	(1,434)	(4,315)
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	$ 6,099	$ (6,491)	$ 6,379	$ (8,084)