XML 45 R62.htm IDEA: XBRL DOCUMENT v2.4.0.6
Financial Instruments - Additional Information (Detail)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Sales Revenue, Goods, Net
Entity
Dec. 31, 2011
Sales Revenue, Goods, Net
Entity
Dec. 31, 2010
Sales Revenue, Goods, Net
Entity
Dec. 31, 2012
Accounts Receivable
Dec. 31, 2011
Accounts Receivable
Apr. 30, 2012
Interest rate swap agreements
USD ($)
Contract
Dec. 31, 2012
Interest rate swap agreements
USD ($)
Dec. 31, 2011
Interest rate swap agreements
USD ($)
Dec. 31, 2010
Interest rate swap agreements
USD ($)
Dec. 31, 2012
Interest rate swap agreements
Us Term Loan
Dec. 31, 2012
Interest rate swap agreements
Euro Term Loan
Dec. 31, 2012
Interest rate swap agreements
Accrued liabilities
USD ($)
Dec. 31, 2011
Interest rate swap agreements
Accrued liabilities
USD ($)
Dec. 31, 2012
Interest rate swap agreements
Other liabilities
USD ($)
Dec. 31, 2011
Interest rate swap agreements
Other liabilities
USD ($)
Apr. 30, 2012
Interest Rate Swap Contract One
Apr. 30, 2012
Interest Rate Swap Contract Two
Apr. 30, 2012
Interest Rate Swap Contract Three
Dec. 31, 2012
Euro Interest Rate Swap
USD ($)
Dec. 31, 2012
Euro Interest Rate Swap
EUR (€)
Dec. 31, 2012
Natural gas swap agreements
USD ($)
MMBTU
Dec. 31, 2011
Natural gas swap agreements
USD ($)
MMBTU
Dec. 31, 2010
Natural gas swap agreements
USD ($)
Dec. 31, 2012
Natural gas swap agreements
Minimum
Dec. 31, 2012
Natural gas swap agreements
Maximum
Dec. 31, 2012
Natural gas swap agreements
Accrued liabilities
USD ($)
Dec. 31, 2011
Natural gas swap agreements
Accrued liabilities
USD ($)
Dec. 31, 2012
Foreign Currency Exchange Rate Risk
USD ($)
Dec. 31, 2011
Foreign Currency Exchange Rate Risk
USD ($)
Dec. 31, 2010
Foreign Currency Exchange Rate Risk
USD ($)
Derivative [Line Items]                                                              
Aggregate notional principal amount of outstanding interest rate swap agreements               $ 289,000,000 $ 136,000,000                                            
Interest rate swap agreement fixed interest rate                                 0.75% 1.38% 1.64%   4.10%                    
Notional principal amount for each interest rate swap agreement             50,000,000                           105,000,000                    
Agreement maturity year                                       2,014                      
Number of interest rate swap agreements             3                                                
Interest rate swap agreement maturity period                                 2015-06 2017-06 2017-06                        
Interest rate swap agreement beginning period                                   2013-06 2014-06                        
Net payments under derivative swap agreements               4,600,000 4,700,000 7,600,000                       1,200,000 600,000 1,200,000              
Effective interest rate on term loans                     1.85% 2.90%                                      
Fair value of total outstanding swap agreements                         5,600,000 3,900,000 7,700,000 7,300,000                     300,000 800,000      
Percentage of hedged estimated twelve month exposure to fluctuations in natural gas prices                                           21.00% 29.00% 39.00%              
Natural gas fixed prices per MMBtu                                                 2.59 4.81          
Aggregate notional principal amount of natural gas swap agreements                                           1,000,000 700,000                
Foreign currency gains of net investment hedges included in accumulated other comprehensive (loss) income, net of deferred tax benefit                                                         $ (9,200,000) $ 15,300,000 $ 14,900,000
Number of customers   3 3 3                                                      
Concentration risk, percentage 99.00% 28.20% 27.10% 30.50% 20.60% 20.70%