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Equity (Details Narrative) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares € / shares shares | Oct. 31, 2018 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2016 € / shares shares | Mar. 31, 2019 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Mar. 29, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value | $ / shares |  |  |  |  |  |  | $ 14.31 |  |  |
Shares issued upon exercise of stock options, shares | shares |  |  |  |  |  |  | 140,579 | 103,230 | 123,150 |
Exercises, aggregate exercise prices |  |  |  |  |  |  | $ 4,310 | $ 2,258 | $ 1,860 |
Dividends Payable |  |  | $ 8,600 |  |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ / shares | $ 0.275 | $ 0.275 | $ 1.10 |  |  |  | $ 0.275 |  |  |
Percentage of Increase in Annual Dividend |  |  | 31.00% |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  | $ 1.10 |  |  |  | $ 0.91 | $ 0.72 | $ 0.62 |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |  |  |  |  | $ 1,100 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.275
Dividends Payable, Date to be Paid |  |  |  |  |  | Apr. 15, 2019 |  |  |  |
Dividends Payable, Date of Record |  |  |  |  |  | Mar. 29, 2019 |  |  |  |
Interparfums SA Subsidiary [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value | $ / shares | $ 34.00 |  |  | $ 22.00 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares | 142,842 | 142,842 |  | 157,840 | 157,840 |  | 142,842 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost | $ 4,900 |  |  | $ 3,400 |  |  |  |  |  |
Share based Compensation Arrangement by Share based Payment Award Value Shares Purchased for Award |  |  |  |  |  |  | $ 800 |  | $ 2,900 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award | shares |  |  |  |  |  |  | 18,899 |  | 131,101 |
Interparfums SA Subsidiary [Member] | Euro [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value | € / shares |  | $ 29.84 |  |  | € 18.56 |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued upon exercise of stock options, shares | shares |  |  |  |  |  |  |  |  | 19,000 |
Exercises, aggregate exercise prices |  |  |  |  |  |  |  |  | $ 700 |
Shares Paid For Stock Options Exercised | shares |  |  |  |  |  |  |  |  | 20,658 |
Shares tendered for tax withholding | shares |  |  |  |  |  |  |  |  | 2,179 |
Employees [Member] | Interparfums SA Subsidiary [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares | 26,600 | 26,600 |  | 15,100 | 15,100 |  | 26,600 |  |  |
Officers And Managers [Member] | Interparfums SA Subsidiary [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares | 133,000 | 133,000 |  | 133,000 | 133,000 |  | 133,000 |  |  |
Equity Option [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of shares vested |  |  |  |  |  |  | $ 1,100 | $ 900 |  |
Number of shares available for grant | shares | 744,215 | 744,215 |  |  |  |  | 744,215 |  |  |
Aggregate intrinsic value of options outstanding | $ 18,800 | $ 18,800 |  |  |  |  | $ 18,800 |  |  |
Unrecognized compensation cost related to stock options | $ 4,900 | $ 4,900 |  |  |  |  | $ 4,900 |  |  |
Term |  |  |  |  |  |  | 6 years |  |  |
Unrecognized compensation cost, recognition period |  |  |  |  |  |  | 5 years |  |  |
Weighted average grant date fair value | $ / shares |  |  |  |  |  |  | $ 14.31 | $ 9.82 | $ 7.43 |
Options exercisable, weighted average exercise price | $ / shares | $ 31.65 | $ 31.65 |  |  |  |  | $ 31.65 |  |  |
Weighted average remaining contractual life of options outstanding, options exercisable |  |  |  |  |  |  | 2 years 6 months 25 days |  |  |
Aggregate intrinsic value of exercisable options | $ 9,900 | $ 9,900 |  |  |  |  | $ 9,900 |  |  |
Equity Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 4 years |  |
Equity Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 5 years |  |

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