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Key Assumptions used in Determining Benefit Plan Costs and Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Rate of Compensation Increase	3.00%	3.50%	3.50%
Expected Long-term rate of return on plan assets	8.50%
Benefit Plan Costs
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.60%	5.35%	5.75%
Rate of Compensation Increase	3.00%	3.50%	3.50%
Expected Long-term rate of return on plan assets	8.50%	8.50%	8.50%
Health Care Cost Trend Rate Assumed for Next Year	6.50%	7.00%	7.50%
Ultimate Health Care Cost Trend Rate	4.00%	4.00%	4.00%
Year that Ultimate Health care Cost Trend Rate is reached	2017	2017	2017
Effect of 1% Increase in Health Care Cost Trend Rate	981	909	728
Effect of 1% Decrease in Health Care Cost Trend Rate	(756)	(705)	(565)
Benefit Obligation
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.00%	4.60%	5.35%
Rate of Compensation Increase	3.00%	3.00%	3.50%
Health Care Cost Trend Rate Assumed for Next Year	8.00%	6.50%	7.00%
Ultimate Health Care Cost Trend Rate	4.00%	4.00%	4.00%
Year that Ultimate Health care Cost Trend Rate is reached	2017	2017	2017
Effect of 1% Increase in Health Care Cost Trend Rate	11,808	9,109	7,530
Effect of 1% Decrease in Health Care Cost Trend Rate	(9,291)	(7,217)	(5,997)

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

- Definition

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

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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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-Section 50

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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

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-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

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-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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- Definition

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

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X

- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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

-Publisher FASB

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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

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X

- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

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

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-Topic 715

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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