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Net Income Attributable to Inter Parfums, Inc. Common Shareholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:      
Numerator for diluted earnings per share $ 41,594 $ 33,331 $ 30,437
Denominator:      
Weighted average shares (in shares) 31,172,285 31,072,328 30,996,137
Effect of dilutive securities:      
Stock options (in shares) 132,816 103,270 104,078
Denominator for diluted earnings per share (in shares) 31,305,101 31,175,598 31,100,215
Net income attributable to Inter Parfums, Inc. common shareholders:      
Basic (in dollar per share) $ 1.33 $ 1.07 $ 0.98
Diluted (in dollar per share) $ 1.33 $ 1.07 $ 0.98