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Financial Instruments - Additional Information (Detail)
9 Months Ended9 Months Ended
Sep. 30, 2011
USD ($)
Sep. 30, 2011
Interest rate swap agreements
USD ($)
Sep. 30, 2011
Interest rate swap agreements
EUR (€)
Sep. 30, 2011
Maximum
Natural gas swap agreements
Sep. 30, 2011
Minimum
Natural gas swap agreements
Sep. 30, 2011
Natural gas swap agreements
USD ($)
MMBtu
Sep. 30, 2011
Foreign Currency Exchange Rate Risk
USD ($)
Sep. 30, 2011
Foreign Currency Exchange Rate Risk
EUR (€)
Sep. 30, 2011
Accrued liabilities
USD ($)
Sep. 30, 2011
Other liabilities
USD ($)
Derivative [Line Items]          
Fair value of total outstanding swap agreements$ 11,900,000       $ 4,300,000$ 7,600,000
Amount of loss reclassified to earnings from derivatives component of accumulated other comprehensive (loss) income2,300,000         
Estimated amount of loss to be reclassified to earnings from derivatives component of accumulated other comprehensive (loss) income during the next twelve months(2,300,000)         
Percentage of hedged estimated twelve month exposure to fluctuations in natural gas prices     20.00%    
Aggregate notional principal amount of outstanding interest rate swap agreements  125,000,000       
Net payments under derivative swap agreements (3,700,000)   (300,000)    
Aggregate notional principal amount of natural gas swap agreements     653,000    
Natural gas fixed prices per MMBtu   4.9854.210     
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      (5,900,000)   
Deferred tax benefit, net      $ (2,400,000)