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STOCK PLANS (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Assumptions used in the Black Scholes option pricing model  
Expected volatility 51.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Expected dividend yield 2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Expected term (in years) 6 years
Risk-free interest rate 1.36%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Exercise price (in dollars per share) $ 15.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Restricted Stock Units, Market Based  
Assumptions used in the Black Scholes option pricing model  
Expected dividend yield 3.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= knl_RestrictedStockUnitsMarketBasedMember
Expected term (in years) 3 years
Risk-free interest rate 2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= knl_RestrictedStockUnitsMarketBasedMember
Exercise price (in dollars per share) $ 8.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= knl_RestrictedStockUnitsMarketBasedMember
Restricted Stock Units, Market Based | Low end of range  
Assumptions used in the Black Scholes option pricing model  
Expected volatility 41.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= knl_RestrictedStockUnitsMarketBasedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Restricted Stock Units, Market Based | High end of range  
Assumptions used in the Black Scholes option pricing model  
Expected volatility 54.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= knl_RestrictedStockUnitsMarketBasedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember