Net Income Attributable to Inter Parfums, Inc. Common Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Numerator for diluted earnings per share	$ 53,793	$ 41,594	$ 33,331
Denominator:
Weighted average shares (in shares)	31,307,991	31,172,285	31,072,328
Effect of dilutive securities:
Stock options (in shares)	214,380	132,816	103,270
Denominator for diluted earnings per share (in shares)	31,522,371	31,305,101	31,175,598
Net income attributable to Inter Parfums, Inc. common shareholders:
Basic (in dollar per share)	$ 1.72	$ 1.33	$ 1.07
Diluted (in dollar per share)	$ 1.71	$ 1.33	$ 1.07