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Recent Agreements (Details)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Abercrombie and Fitch [Member]
Dec. 31, 2013
Oscar de la Renta [Member]
USD ($)
Dec. 31, 2013
Agent Provocateur [Member]
Dec. 31, 2013
Shanghai Tang [Member]
Dec. 31, 2012
Dunhill [Member]
USD ($)
Dec. 31, 2012
Karl Lagerfeld [Member]
USD ($)
Dec. 31, 2012
Karl Lagerfeld [Member]
EUR (€)
Licensing Agreements [Line Items]              
License agreement term 7 years 12 years 10 years 6 months 12 years 10 years 20 years 20 years
License entry fee   $ 5.0us-gaap_LicenseCosts
/ ipar_LicensingAgreementsAxis
= ipar_OscarDeLaRentaMember		     $ 0.9us-gaap_LicenseCosts
/ ipar_LicensingAgreementsAxis
= ipar_DunhillMember		 $ 12.5us-gaap_LicenseCosts
/ ipar_LicensingAgreementsAxis
= ipar_KarlLagerfeldMember		 € 9.6us-gaap_LicenseCosts
/ ipar_LicensingAgreementsAxis
= ipar_KarlLagerfeldMember
Advance royalty payment           12.5us-gaap_PrepaidRoyalties
/ ipar_LicensingAgreementsAxis
= ipar_KarlLagerfeldMember		 9.6us-gaap_PrepaidRoyalties
/ ipar_LicensingAgreementsAxis
= ipar_KarlLagerfeldMember
Royalties due, minimum amount to use prepaid credit             0.5ipar_RoyaltiesPayablePrepaidRoyaltiesThreshold
/ ipar_LicensingAgreementsAxis
= ipar_KarlLagerfeldMember
Credit against future royalty payments, maximum amount             0.5ipar_PrepaidRoyaltiesFutureAmountMaximumCredit
/ ipar_LicensingAgreementsAxis
= ipar_KarlLagerfeldMember
Advance royalty payment, net present value           $ 4.4ipar_PrepaidRoyaltiesNetPresentValue
/ ipar_LicensingAgreementsAxis
= ipar_KarlLagerfeldMember