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Financial Instruments Financial Instruments - Natural Gas Swap Agreements (Detail) - Natural Gas Commodity [Member] MMBTU in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) MMBTU $ / MMBTU | Dec. 31, 2014 USD ($) MMBTU | Dec. 31, 2013 USD ($)
Derivative [Line Items] |  |  |
Percentage of hedged twelve month exposure to fluctuations in natural gas prices | 28.00% | 6.00% | 27.00%
Net (payments) receipts under derivative swap agreements | $ | $ (1.2) | $ 0.1 | $ (0.2)
Derivative, Nonmonetary Notional Amount | MMBTU | 1.4 | 1.0 |
Natural Gas Commodity [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Underlying, Derivative | 2.91 |  |
Natural Gas Commodity [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Underlying, Derivative | 4.17 |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The premium (cost) of a hedge, net of any cash received on settlement during the period. + References No definition available. + Details
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- Details
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