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Financial Instruments - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Derivative [Line Items]    
Senior note interest rate 5.00% 5.00%
Amount of losses, net of income taxes, reclassified to earnings from change in fair value of derivatives component of accumulated other comprehensive loss $ 800,000 $ 1,700,000
Estimated reclassification of losses, net of income taxes, from the change in fair value of derivatives component of accumulated other comprehensive loss to earnings during the next twelve months   3,600,000
Interest Rate Swap and Natural Gas Swap Agreements
   
Derivative [Line Items]    
Derivative liabilities 8,800,000 8,800,000
Interest rate swap agreements
   
Derivative [Line Items]    
Aggregate notional principal amount of outstanding interest rate swap agreements 286,900,000 286,900,000
Net payments under derivative swap agreements 1,400,000 2,800,000
Foreign Currency Exchange Rate Risk
   
Derivative [Line Items]    
Foreign currency (losses) gains of net investment hedges included in accumulated other comprehensive (loss) income (4,800,000) 4,700,000
Accrued liabilities | Interest Rate Swap and Natural Gas Swap Agreements
   
Derivative [Line Items]    
Derivative liabilities 6,200,000 6,200,000
Other liabilities | Interest Rate Swap and Natural Gas Swap Agreements
   
Derivative [Line Items]    
Derivative liabilities 2,600,000 2,600,000
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Derivative [Line Items]    
Cash and cash equivalents 113,195,000 113,195,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest rate swap agreements
   
Derivative [Line Items]    
Derivative liabilities 8,466,000 8,466,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Natural gas swap agreements
   
Derivative [Line Items]    
Derivative liabilities 316,000 316,000
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Derivative [Line Items]    
Cash and cash equivalents 113,195,000 113,195,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest rate swap agreements
   
Derivative [Line Items]    
Derivative liabilities 8,466,000 8,466,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Natural gas swap agreements
   
Derivative [Line Items]    
Derivative liabilities 316,000 316,000
Bank Debt | Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Derivative [Line Items]    
Long-Term Debt 1,378,234,000 1,378,234,000
Bank Debt | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Derivative [Line Items]    
Long-Term Debt 1,378,234,000 1,378,234,000
Senior Notes Five Percent [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Derivative [Line Items]    
Long-Term Debt 500,000,000 500,000,000
Senior Notes Five Percent [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Derivative [Line Items]    
Long-Term Debt 497,500,000 497,500,000
Natural Gas Commodity [Member] | Natural gas swap agreements
   
Derivative [Line Items]    
Aggregate notional principal amount of natural gas swap agreements in MMBtu 730,000 730,000
Percentage of hedged estimated twelve month exposure to fluctuations in natural gas prices 14.00% 14.00%
Net receipts under natural gas swap agreements $ 100,000 $ 100,000
Natural Gas Commodity [Member] | Natural gas swap agreements | Minimum
   
Derivative [Line Items]    
Natural gas fixed prices per MMBtu 3.630 3.630
Natural Gas Commodity [Member] | Natural gas swap agreements | Maximum
   
Derivative [Line Items]    
Natural gas fixed prices per MMBtu 4.548 4.548