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Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 1 Months Ended
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Sep. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2012 Accrued liabilities | Sep. 30, 2012 Other liabilities | Sep. 30, 2012 Interest rate swap agreements | Sep. 30, 2012 Interest rate swap agreements | Apr. 30, 2012 Interest rate swap agreements Contract | Sep. 30, 2012 Natural gas swap agreements MMBTU | Sep. 30, 2012 Natural gas swap agreements MMBTU | Sep. 30, 2012 Natural gas swap agreements Minimum | Sep. 30, 2012 Natural gas swap agreements Maximum | Sep. 30, 2012 Foreign Currency Exchange Rate Risk | Sep. 30, 2012 Foreign Currency Exchange Rate Risk | Apr. 30, 2012 Interest Rate Swap Contract One | Apr. 30, 2012 Interest Rate Swap Contract Two | Apr. 30, 2012 Interest Rate Swap Contract Three
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of total outstanding swap agreements | $ 13,800,000 | $ 13,800,000 | $ 5,300,000 | $ 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of loss reclassified to earnings from derivatives component of accumulated other comprehensive (loss) income | 800,000 | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amount of loss to be reclassified to earnings from derivatives component of accumulated other comprehensive (loss) income during the next twelve months, net of income taxes |  | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional principal amount of outstanding interest rate swap agreements |  |  |  |  | 285,600,000 | 285,600,000 |  |  |  |  |  |  |  |  |  |
Net payments under derivative swap agreements |  |  |  |  | 1,200,000 | 3,200,000 |  | 200,000 | 1,200,000 |  |  |  |  |  |  |
Number of interest rate swap agreements |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Notional principal amount for each interest rate swap agreement |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Interest rate swap agreement fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% | 1.38% | 1.64%
Interest rate swap agreement maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  | 2015-06 | 2017-06 | 2017-06
Interest rate swap agreement beginning period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013-06 | 2014-06
Aggregate notional principal amount of natural gas swap agreements |  |  |  |  |  |  |  | 546,000 | 546,000 |  |  |  |  |  |  |
Natural gas fixed prices per MMBtu |  |  |  |  |  |  |  |  |  | 3.029 | 4.814 |  |  |  |  |
Percentage of hedged estimated twelve month exposure to fluctuations in natural gas prices |  |  |  |  |  |  |  | 13.00% | 13.00% |  |  |  |  |  |  |
Foreign currency losses of net investment hedges included in accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  | $ (15,100,000) | $ 1,100,000 |  |  |

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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 The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -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 The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 3 -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 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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