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Fair Value of Financial Instruments (Details 4) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
5.125% Senior Notes due 2019  
Fair Value of Fixed - Rate Notes  
Fair value of Fixed - Rate Notes $ 390,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ngl_SeniorNotes5.125PercentDue2021Member
6.875% Notes due 2021  
Fair Value of Fixed - Rate Notes  
Fair value of Fixed - Rate Notes 475,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ngl_SeniorNotes6.875PercentDue2021Member
6.650% Notes due 2022  
Fair Value of Fixed - Rate Notes  
Fair value of Fixed - Rate Notes $ 275,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember