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Stock Compensation Plans - Principal Assumptions for SSAR's Granted Fair Value (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted average fair value of SSAR's granted during the period $ 10.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Assumptions:  
Risk-free interest rate 0.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected volatility 22.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Expected dividend yield 2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Expected life, in years 5 years
Termination rate 1.05%iff_TerminationRateAssumptionInBinomialLatticeModel
Exercise multiple 1.44iff_ExerciseMultipleAssumptionInBinomialLatticeModel