Quarterly report pursuant to Section 13 or 15(d)

Derivatives And Fair Value (Derivative Instruments Accounted For At Fair Value On A Recurring Basis) (Detail)

v3.5.0.2
Derivatives And Fair Value (Derivative Instruments Accounted For At Fair Value On A Recurring Basis) (Detail) - Commodity Contract [Member] - Not Designated as Hedging Instrument [Member] - Prepayments and other [Member]
$ in Thousands
Sep. 30, 2016
USD ($)
Derivatives, Fair Value [Line Items]  
Derivative Assets (Liabilities), at Fair Value, Net $ 70
Fair Value, Inputs, Level 2 [Member]  
Derivatives, Fair Value [Line Items]  
Derivative Assets (Liabilities), at Fair Value, Net $ 70