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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
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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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + 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 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 2: 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. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition Before tax and net of reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892 + Details
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