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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments $ 225,862us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 244,302us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
U.S. equity securities    
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments 115,102us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_USEquitySecuritiesMember		 128,766us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_USEquitySecuritiesMember
Non-U.S. equity securities    
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments 22,081us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_ForeignEquitySecuritiesMember		 25,461us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_ForeignEquitySecuritiesMember
Fixed income funds and cash investment funds    
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments 88,679us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_DebtSecuritiesFixedIncomeAndCashInvestmentFundsMember		 90,075us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_DebtSecuritiesFixedIncomeAndCashInvestmentFundsMember
Level 1    
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments 225,862us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 244,302us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 1 | U.S. equity securities    
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments 115,102us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_USEquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 128,766us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_USEquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 1 | Non-U.S. equity securities    
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments 22,081us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_ForeignEquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 25,461us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_ForeignEquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 1 | Fixed income funds and cash investment funds    
PENSIONS AND OTHER POSTRETIREMENT BENEFITS    
Fair value of pension plan investments $ 88,679us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_DebtSecuritiesFixedIncomeAndCashInvestmentFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 $ 90,075us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= knl_DebtSecuritiesFixedIncomeAndCashInvestmentFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member