QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
QUARTERLY DATA (UNAUDITED)
Net sales	$ 671,333	$ 701,278	$ 742,661	$ 744,460	$ 685,028	$ 665,775	$ 710,608	$ 703,350	$ 2,859,732	$ 2,764,761	$ 2,469,283
Gross profit	193,588	215,222	231,739	233,841	184,775	192,544	209,018	209,171	874,390	795,508
Net Income	48,538	56,769	73,921	62,999	40,675	39,022	55,781	59,288	242,227	194,766	220,029
Net Income Attributable to AptarGroup, Inc.	$ 48,533	$ 56,750	$ 73,915	$ 63,004	$ 40,674	$ 38,996	$ 55,775	$ 59,300	$ 242,202	$ 194,745	$ 220,030
Net Income Attributable to AptarGroup, Inc. Per Common Share:
Basic (in dollars per share)	$ 0.76	$ 0.89	$ 1.16	$ 1.00	$ 0.65	$ 0.63	$ 0.89	$ 0.95	$ 3.81	$ 3.12	$ 3.52
Diluted (in dollars per share)	$ 0.73	$ 0.85	$ 1.12	$ 0.96	$ 0.62	$ 0.60	$ 0.86	$ 0.92	$ 3.66	$ 3.00	$ 3.41
Average number of shares outstanding:
Basic (in shares)	63,835	64,010	63,471	62,964	62,834	62,378	62,402	62,128	63,574	62,437	62,435
Diluted (in shares)	66,192	66,702	66,232	65,349	65,344	65,129	64,850	64,414	66,150	64,958	64,596