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Financial Instruments - Additional Information (Detail) | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 USD ($) | Jun. 30, 2011 Accrued liabilities USD ($) | Jun. 30, 2011 Other liabilities USD ($) | Jun. 30, 2011 Interest rate swap agreements USD ($) | Jun. 30, 2011 Interest rate swap agreements EUR (€) | Jun. 30, 2011 Maximum Natural gas swap agreements | Jun. 30, 2011 Minimum Natural gas swap agreements | Jun. 30, 2011 Natural gas swap agreements USD ($) MMBtu | Jun. 30, 2011 Foreign Currency Exchange Rate Risk USD ($) | Jun. 30, 2011 Foreign Currency Exchange Rate Risk EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of total outstanding swap agreements | $ 9,200,000 | $ 3,800,000 | $ 5,400,000 |  |  |  |  |  |  |
Amount of loss reclassified to earnings from derivatives component of accumulated other comprehensive (loss) income | 1,600,000 |  |  |  |  |  |  |  |  |
Estimated amount of loss to be reclassified to earnings from derivatives component of accumulated other comprehensive (loss) income during the next twelve months | (2,000,000) |  |  |  |  |  |  |  |  |
Percentage of hedged estimated twelve month exposure to fluctuations in natural gas prices |  |  |  |  |  |  |  | 15.00% |  |
Aggregate notional principal amount of outstanding interest rate swap agreements |  |  |  |  | 125,000,000 |  |  |  |  |
Net payments under derivative swap agreements |  |  |  | 2,600,000 |  |  |  | 200,000 |  |
Aggregate notional principal amount of natural gas swap agreements |  |  |  |  |  |  |  | 479,000 |  |
Natural gas fixed prices per MMBtu |  |  |  |  |  | 4.985 | 4.198 |  |  |
Euro denominated borrowings designated as net investment hedges |  |  |  |  |  |  |  |  |  | 320,000,000
Foreign currency losses of net investment hedges included in accumulated other comprehensive (loss) income, net of deferred tax benefit |  |  |  |  |  |  |  |  | 30,600,000 |
Deferred tax benefit, net |  |  |  |  |  |  |  |  | $ (12,800,000) |

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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 + Details
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