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Share-Based Payments (Schedule of Nonvested Option Activity) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Nonvested Options, Number of Shares    
Beginning of period 385,505us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares  
Granted 14,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Vested or forfeited (7,085)ipar_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsVestedOrForfeitedInPeriod  
End of period 392,420us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares  
Weighted Average Grant Date Fair Value    
Beginning of period $ 7.14us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue  
Granted $ 6.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 8.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Vested or forfeited $ 6.39ipar_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOrForfeitedInPeriodWeightedAverageGrantDateFairValue  
End of period $ 7.14us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue