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GOODWILL AND INTANGIBLE ASSETS - Schedule of Expected Future Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2015 (remaining three months) $ 1,759us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 6,455us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 5,850us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 5,004us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 4,044us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 10,757us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total $ 33,869ntct_FiniteLivedIntangibleAssetsAmortizationExpenseNet