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Fair Value of Financial Instruments (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 21, 2013
Oct. 01, 2010
Oct. 17, 2012
Dec. 12, 2013
Mar. 31, 2015
Term loan B-2          
Fair value measurements          
Face value of debt instrument $ 1,507,500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= nty_TermLoanB2Member		        
Notes          
Fair value measurements          
Face value of debt instrument   650,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Holdco Notes          
Fair value measurements          
Face value of debt instrument     550,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		    
Parent Company | Holdco Notes          
Fair value measurements          
Face value of debt instrument     550,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		 450,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		  
Level 2 | Term loan B-2          
Fair value measurements          
Face value of debt instrument         1,507,500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= nty_TermLoanB2Member
Level 2 | Notes          
Fair value measurements          
Fair value of Notes         $ 677,677us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember