Net Income Attributable to Inter Parfums, Inc. Common Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income attributable to Inter Parfums, Inc.	$ 18,938	$ 17,077	$ 45,746	$ 37,194
Denominator:
Weighted average shares	31,326	31,175	31,297	31,163
Effect of dilutive securities: Stock options	261	132	205	118
Denominator for diluted earnings per share	31,587	31,307	31,502	31,281
Earnings per share:
Basic (in dollars per share)	$ 0.60	$ 0.55	$ 1.46	$ 1.19
Diluted (in dollars per share)	$ 0.60	$ 0.55	$ 1.45	$ 1.19