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Derivative Financial Instruments and Hedging Activities - Summary of Outstanding Derivative Financial Instruments (Detail) - Natural Gas Swap Agreements | 12 Months Ended
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Dec. 31, 2016 MMBTU $ / MMBTU | Dec. 31, 2015 MMBTU $ / MMBTU
Derivative [Line Items] |  |
Commodity Derivatives Weighted Average Contract Price | $ / MMBTU | 3.37 | 3.20
Commodity Derivatives Contract Volume | MMBTU | 23,400,000 | 1,800,000
Commodity Derivatives Contract Period | 2017 | 2016

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- Definition Commodity derivatives contract volume. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
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- Details
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