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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract]                      
Net income (loss) $ 5,308us-gaap_NetIncomeLoss $ 5,076us-gaap_NetIncomeLoss $ 8,703us-gaap_NetIncomeLoss $ 224us-gaap_NetIncomeLoss $ 1,295us-gaap_NetIncomeLoss $ 356us-gaap_NetIncomeLoss $ 6,359us-gaap_NetIncomeLoss $ (640)us-gaap_NetIncomeLoss $ 19,311us-gaap_NetIncomeLoss $ 7,370us-gaap_NetIncomeLoss $ (2,805)us-gaap_NetIncomeLoss
Net income allocated to unvested restricted stock                 (368)ntri_NetIncomeAllocatedToUnvestedRestrictedStock (183)ntri_NetIncomeAllocatedToUnvestedRestrictedStock 0ntri_NetIncomeAllocatedToUnvestedRestrictedStock
Net income (loss) allocated to common shares                 $ 18,943ntri_NetIncomeLossAllocatedToCommonShares $ 7,187ntri_NetIncomeLossAllocatedToCommonShares $ (2,805)ntri_NetIncomeLossAllocatedToCommonShares
Weighed average shares outstanding:                      
Basic (in Shares)                 28,323us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 28,013us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,499us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in Shares)                 464us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 274us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted (in Shares)                 28,787us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 28,287us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,499us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income (loss) per common share (in Dollars per Share) $ 0.18us-gaap_EarningsPerShareBasic $ 0.18us-gaap_EarningsPerShareBasic $ 0.30us-gaap_EarningsPerShareBasic $ 0.01us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ 0.01us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ (0.02)us-gaap_EarningsPerShareBasic $ 0.67us-gaap_EarningsPerShareBasic $ 0.26us-gaap_EarningsPerShareBasic $ (0.10)us-gaap_EarningsPerShareBasic
Diluted income (loss) per common share (in Dollars per Share) $ 0.18us-gaap_EarningsPerShareDiluted $ 0.17us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted $ 0.22us-gaap_EarningsPerShareDiluted $ (0.02)us-gaap_EarningsPerShareDiluted $ 0.66us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted $ (0.10)us-gaap_EarningsPerShareDiluted