QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
QUARTERLY DATA (UNAUDITED)
Net sales	$ 685,028	$ 665,775	$ 710,608	$ 703,350	$ 625,895	$ 624,326	$ 617,746	$ 601,316	$ 2,764,761	$ 2,469,283	$ 2,330,934
Gross profit	184,775	192,544	209,018	209,171	179,217	179,166	183,346	181,729	795,508	723,458
Net Income	40,675	39,022	55,781	59,288	49,506	53,529	65,189	51,805	194,766	220,029	205,604
Net Income Attributable to AptarGroup, Inc.	$ 40,674	$ 38,996	$ 55,775	$ 59,300	$ 49,513	$ 53,523	$ 65,174	$ 51,820	$ 194,745	$ 220,030	$ 205,590
Net Income Attributable to AptarGroup, Inc. Per Common Share:
Basic (in dollars per share)	$ 0.65	$ 0.63	$ 0.89	$ 0.95	$ 0.80	$ 0.86	$ 1.04	$ 0.83	$ 3.12	$ 3.52	$ 3.27
Diluted (in dollars per share)	$ 0.62	$ 0.60	$ 0.86	$ 0.92	$ 0.77	$ 0.83	$ 1.01	$ 0.81	$ 3.00	$ 3.41	$ 3.17
Average number of shares outstanding:
Basic (in shares)	62,834	62,378	62,402	62,128	61,944	62,592	62,631	62,355	62,437	62,435	62,804
Diluted (in shares)	65,344	65,129	64,850	64,414	64,528	64,821	64,828	64,234	64,958	64,596	64,849