QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
QUARTERLY DATA (UNAUDITED)
Net Sales	$ 625,895	$ 624,326	$ 617,746	$ 601,316	$ 538,868	$ 589,729	$ 619,999	$ 582,338	$ 2,469,283	$ 2,330,934	$ 2,317,149
Gross profit	178,944	178,866	183,056	181,481	149,576	171,574	192,495	173,734	722,347	687,379
Net Income	49,506	53,529	65,189	51,805	49,587	53,100	59,051	43,866	220,029	205,604	199,295
Net Income Attributable to AptarGroup, Inc.	$ 49,513	$ 53,523	$ 65,174	$ 51,820	$ 49,581	$ 53,098	$ 59,048	$ 43,863	$ 220,030	$ 205,590	$ 199,348
Net Income Attributable to AptarGroup, Inc. Per Common Share:
Basic (in dollars per share)	$ 0.80	$ 0.86	$ 1.04	$ 0.83	$ 0.79	$ 0.84	$ 0.94	$ 0.70	$ 3.52	$ 3.27	$ 3.19
Diluted (in dollars per share)	0.77	0.83	1.01	0.81	0.77	0.82	0.91	0.67	3.41	3.17	$ 3.09
Dividends per Common Share (in dollars per share)	0.32	0.32	0.32	0.32	0.32	0.30	0.30	0.30	1.28	1.22
Stock price high (in dollars per share)	89.68	90.79	87.94	77.87	78.10	81.50	80.36	79.04	90.79	81.50
Stock price low (in dollars per share)	$ 84.22	$ 80.69	$ 75.49	$ 71.44	$ 70.32	$ 75.01	$ 74.16	$ 66.33	$ 71.44	$ 66.33
Average number of shares outstanding:
Basic (in shares)	61,944	62,592	62,631	62,355	62,586	62,858	63,053	62,722	62,435	62,804	62,585
Diluted (in shares)	64,528	64,821	64,828	64,234	64,220	64,690	64,785	65,063	64,596	64,849	64,492