ACQUISITIONS (Pro Forma) (Details) - CSP Technologies Member - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Unaudited pro forma financial information
Net Sales	$ 687,201	$ 659,741	$ 2,172,737	$ 1,943,297
Net Income Attributable to AptarGroup, Inc.	$ 48,034	$ 57,829	$ 158,527	$ 168,028
Net Income per common share - basic	$ 0.77	$ 0.92	$ 2.54	$ 2.69
Net Income per common share - diluted	$ 0.74	$ 0.89	$ 2.45	$ 2.60
Acquisition Related Costs
Acquisitions
Transaction costs excluded from supplemental pro forma earnings (after tax)	$ 14,200		$ 16,600
Transaction costs excluded from supplemental pro forma earnings (before tax)	18,500		21,900
Fair Value Adjustment
Acquisitions
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro forma earnings (after tax)	2,600		2,600
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro form earnings (before tax)	$ 3,300		$ 3,300