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Employer Contributions, Participant Contributions and Benefit Payments (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plans
Defined Contribution Benefit Plans [Line Items]
Employer Contributions	$ 9,387,000	$ 8,813,000	$ 4,302,000
Benefit Payments	4,456,000	3,438,000	3,185,000
Other Postretirement Benefit Plans, Defined Benefit
Defined Contribution Benefit Plans [Line Items]
Employer Contributions	2,190,000		3,482,000
Participant Contributions	18,000	13,000
Benefit Payments	2,083,000	1,644,000	1,848,000
Supplemental Employee Retirement Plans, Defined Benefit
Defined Contribution Benefit Plans [Line Items]
Employer Contributions	53,000	53,000	53,000
Benefit Payments	$ 53,000	$ 53,000	$ 53,000

X

- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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+ References

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-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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