ACQUISITIONS (Pro Forma) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Unaudited pro forma financial information
Net Sales	$ 2,857,765	$ 2,605,095
Net Income Attributable to AptarGroup, Inc.	$ 208,717	$ 230,753
Net Income per common share - basic	$ 3.34	$ 3.70
Net Income per common share - diluted	$ 3.21	$ 3.57
CSP Technologies | Acquisition Related Costs
Acquisitions
Transaction costs excluded from supplemental pro forma earnings (after tax)	$ 16,700
Transaction costs excluded from supplemental pro forma earnings (before tax)	22,000
CSP Technologies | Fair Value Adjustment
Acquisitions
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro forma earnings (after tax)	10,900
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro form earnings (before tax)	$ 14,100