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Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Net Assets (Liabilities) Presented in the Statement of Financial Position $ 11,177 $ 3,987
Net Assets (Liabilities) Presented in the Statement of Financial Position (486) (2,285)
Subject to an enforceable master netting arrangement    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 16,847 13,061
Gross Liabilities Offset in the Statement of Financial Position (5,785) (10,555)
Net Assets (Liabilities) Presented in the Statement of Financial Position 11,062 2,506
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount 11,062 2,506
Subject to an enforceable master netting arrangement | Fair liability and fair asset value of derivative instruments    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 3,556 3,976
Gross Liabilities Offset in the Statement of Financial Position (4,042) (6,261)
Net Assets (Liabilities) Presented in the Statement of Financial Position (486) (2,285)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (486) (2,285)
Subject to an enforceable master netting arrangement | Other long-term liabilities    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 1,261 481
Gross Liabilities Offset in the Statement of Financial Position (1,738) (484)
Net Assets (Liabilities) Presented in the Statement of Financial Position (477) (3)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (477) (3)
Subject to an enforceable master netting arrangement | Fair asset and fair liability value of derivative instruments    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 11,177 7,716
Gross Liabilities Offset in the Statement of Financial Position   (3,729)
Net Assets (Liabilities) Presented in the Statement of Financial Position 11,177 3,987
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount 11,177 3,987
Subject to an enforceable master netting arrangement | Deferred charges and other assets, net    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 853 888
Gross Liabilities Offset in the Statement of Financial Position (5) (81)
Net Assets (Liabilities) Presented in the Statement of Financial Position 848 807
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount $ 848 $ 807