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ACQUISITIONS (Pro Forma) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mega Airless | Acquisition Related Costs      
Acquisitions      
Transaction costs excluded from supplemental pro forma earnings (after tax)     $ 4,200
Transaction costs excluded from supplemental pro forma earnings (before tax)     5,600
Mega Airless | Fair Value Adjustment      
Acquisitions      
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro forma earnings (after tax)     1,700
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro form earnings (before tax)     2,600
CSP Technologies Member      
Unaudited pro forma financial information      
Net Sales $ 2,857,765 $ 2,605,095 2,340,000
Net Income Attributable to AptarGroup, Inc. $ 208,717 $ 230,753 $ 213,000
Net Income per common share - basic $ 3.34 $ 3.70 $ 3.39
Net Income per common share - diluted $ 3.21 $ 3.57 $ 3.29
CSP Technologies Member | 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 Member | 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