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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Presentation of Financial Statements      
Percentage of parent and wholly-owned subsidiaries assets and liabilities included in financial statements (in Percent) 100.00%ntri_PercentageOfAssetsAndLiabilitiesIncludedOfParentAndWhollyOwnedSubsidiariesInFinancialStatements    
Cash, Cash Equivalents and Short Term Investments [Abstract]      
Other-than-temporary impairments on investments $ 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount $ 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount $ 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
Inventories      
Reserve for excess and obsolete inventory 460us-gaap_InventoryValuationReserves 725us-gaap_InventoryValuationReserves  
Property, Plant, and Equipment [Line Items]      
Net book value of capitalized software 13,162us-gaap_CapitalizedComputerSoftwareNet 11,473us-gaap_CapitalizedComputerSoftwareNet  
Long-Lived Assets      
Reductions to remaining useful lives or write-downs of long-lived assets 0ntri_LongLivedAssetsRequiredRemainingUsefulLivesReductionsOrRequiredLongLivedAssetsWritedowns    
Derivative Instruments      
Interest rate swap agreements 0us-gaap_DerivativeNumberOfInstrumentsHeld 0us-gaap_DerivativeNumberOfInstrumentsHeld  
Revenue Recognition      
Revenue from shipping and handling charges 2,013us-gaap_ShippingAndHandlingRevenue 2,000us-gaap_ShippingAndHandlingRevenue 2,394us-gaap_ShippingAndHandlingRevenue
Concentration Risk [Line Items]      
Charge recorded to settle a contract dispute   5,000ntri_ChargeRecordedToSettleAContractDispute  
Vendor Rebates      
Reduced cost of revenue, rebate earned 883us-gaap_RecoveryOfDirectCosts 1,068us-gaap_RecoveryOfDirectCosts 1,496us-gaap_RecoveryOfDirectCosts
Amount of rebate receivable recorded in balance sheet 360ntri_VendorRebatesReceivableRecordedInAccountsReceivable 182ntri_VendorRebatesReceivableRecordedInAccountsReceivable  
Marketing Expense      
Period after initial mailing during which benefits are expected to be received (in Duration) 40 days    
Media expense 89,304us-gaap_AdvertisingExpense 77,396us-gaap_AdvertisingExpense 86,948us-gaap_AdvertisingExpense
Future advertisments and promotions, costs prepaid 1,958us-gaap_PrepaidAdvertising 1,010us-gaap_PrepaidAdvertising  
Statement [Line Items]      
Tenant improvement allowance, included in consolidated balance sheets 2,611us-gaap_LeaseIncentivePayableCurrentAndNoncurrent 2,956us-gaap_LeaseIncentivePayableCurrentAndNoncurrent  
Segment Information      
Number of businesses the company is managed and operated as (in Businesses) 1us-gaap_NumberOfOperatingSegments    
Earnings Per Share      
Common stock equivalents excluded from weighted average shares outstanding for diluted income per common share purposes (in Shares) 377us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 786us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,637us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Cash Flow Information      
Payment for income taxes 7,118us-gaap_IncomeTaxesPaid 2,842us-gaap_IncomeTaxesPaid 1,250us-gaap_IncomeTaxesPaid
Payment for interest 168us-gaap_InterestPaid 116us-gaap_InterestPaid 954us-gaap_InterestPaid
Non-cash capital additions 483us-gaap_CapitalExpendituresIncurredButNotYetPaid 42us-gaap_CapitalExpendituresIncurredButNotYetPaid 561us-gaap_CapitalExpendituresIncurredButNotYetPaid
Other Accrued Expenses And Current liabilities [Member]      
Statement [Line Items]      
Tenant improvement allowance, included in consolidated balance sheets 345us-gaap_LeaseIncentivePayableCurrentAndNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember		 345us-gaap_LeaseIncentivePayableCurrentAndNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember		  
Non-current Liabilities [Member]      
Statement [Line Items]      
Tenant improvement allowance, included in consolidated balance sheets $ 2,266us-gaap_LeaseIncentivePayableCurrentAndNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		 $ 2,611us-gaap_LeaseIncentivePayableCurrentAndNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		  
Fullfillment Operations Percent Outsourced To Thirdparty Provider [Member]      
Concentration Risk [Line Items]      
Percent concentration risk (in Percent) 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_FullfillmentOperationsPercentOutsourcedToThirdpartyProviderMember		    
Minimum Percent Orders Shipped by One Third Pary Provider [Member]      
Concentration Risk [Line Items]      
Percent concentration risk (in Percent) 94.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_PercentOrdersShippedByOneThirdPartyProviderMember		    
Inventory Purchases [Member] | Major Supplier One Of Two [Member]      
Concentration Risk [Line Items]      
Percent concentration risk (in Percent) 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_MajorSupplierOneOfTwoMember		 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_MajorSupplierOneOfTwoMember		 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_MajorSupplierOneOfTwoMember
Inventory Purchases [Member] | Major Supplier Two Of Two [Member]      
Concentration Risk [Line Items]      
Percent concentration risk (in Percent) 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_MajorSupplierTwoOfTwoMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_MajorSupplierTwoOfTwoMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ntri_MajorSupplierTwoOfTwoMember
Fixed Assets [Member] | Minimum [Member]      
Property, Plant, and Equipment [Line Items]      
Estimated useful life (in Duration) 2 years    
Fixed Assets [Member] | Maximum [Member]      
Property, Plant, and Equipment [Line Items]      
Estimated useful life (in Duration) 7 years    
Internal-Use Software and Website Development [Member] | Minimum [Member]      
Property, Plant, and Equipment [Line Items]      
Estimated useful life (in Duration) 2 years    
Internal-Use Software and Website Development [Member] | Maximum [Member]      
Property, Plant, and Equipment [Line Items]      
Estimated useful life (in Duration) 5 years