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FAIR VALUE MEASUREMENT (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of life insurance policies 70rol_DeferredCompensationArrangementWithIndividualNumberOfLifeInsurancePolicies    
Life insurance policies, net face value $ 42,400rol_DeferredCompensationArrangementWithIndividualLifeInsuranceFaceValueNet    
Cash surrender value of life insurance policies 12,700us-gaap_CashSurrenderValueOfLifeInsurance 11,500us-gaap_CashSurrenderValueOfLifeInsurance  
Deferred compensation assets 13,700us-gaap_DeferredCompensationPlanAssets 13,700us-gaap_DeferredCompensationPlanAssets  
Defined Contribution Pension [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents        
Total fair value       
Defined Contribution Pension [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 62us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
480us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Total fair value 62us-gaap_AssetsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
480us-gaap_AssetsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Defined Contribution Pension [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 62us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
480us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Total fair value $ 62us-gaap_AssetsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 480us-gaap_AssetsFairValueDisclosure
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedContributionPensionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember