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Partnership's Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]    
Long-term debt, carrying Amount $ 83,008 $ 91,641
Current maturities of long-term debt, carrying Amount 10,000 16,200
Long-term portion of debt, Carrying Amount [1] 73,008 75,441
Long-term debt, fair value [2] 83,800 92,500
Current maturities of long-term debt, fair value [2] 10,000 16,200
Long-term portion of debt, fair value [1],[2] 73,800 76,300
Term Loan    
Debt Instrument [Line Items]    
Long-term debt, carrying Amount [1] 83,008 91,641
Long-term debt, fair value [1],[2] $ 83,800 $ 92,500
[1] Carrying amounts are net of unamortized debt issuance costs of $0.8 million as December 31, 2016 and $0.9 million as of September 30, 2016.
[2] The face amount of the Partnership's variable rate long-term debt approximates fair value.