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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Summary Of Significant Accounting Policies [Abstract]    
Net income $ 2,943us-gaap_NetIncomeLoss $ 224us-gaap_NetIncomeLoss
Net income allocated to unvested restricted stock (45)ntri_NetIncomeAllocatedToUnvestedRestrictedStock (1)ntri_NetIncomeAllocatedToUnvestedRestrictedStock
Net income allocated to common shares $ 2,898ntri_NetIncomeLossAllocatedToCommonShares $ 223ntri_NetIncomeLossAllocatedToCommonShares
Weighed average shares outstanding:    
Basic (in Shares) 28,392us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 28,065us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in Shares) 541us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 424us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted (in Shares) 28,933us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 28,489us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income per common share (in Dollars per Share) $ 0.10us-gaap_EarningsPerShareBasic $ 0.01us-gaap_EarningsPerShareBasic
Diluted income per common share (in Dollars per Share) $ 0.10us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted