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Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension Benefit Obligations
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.00%	3.70%
Rate of compensation increase	3.30%	3.30%
Postemployment Benefit Obligations
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.40%	4.10%
Rate of compensation increase	3.80%	3.70%
Involuntary turnover rate	1.00%	1.50%
Pension Benefit Costs
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.70%	3.90%
Rate of compensation increase	3.30%	3.30%
Expected return on plan assets	4.00%	4.30%
Postemployment Benefit Costs
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	4.10%	4.40%
Rate of compensation increase	3.70%	3.70%
Involuntary turnover rate	1.50%	2.00%

X

- Definition

Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Involuntary Turnover Rate

+ References

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- Definition

Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Involuntary Turnover Rate

+ References

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X

- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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-Name Accounting Standards Codification

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-Paragraph 5

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- Definition

The interest rate used to adjust for the time value of money.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-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.



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-Topic 715

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



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-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 264

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

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Expected rate of compensation increases (for pay-related plans).

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-Name Accounting Standards Codification

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-SubTopic 20

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