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Multiemployer Defined Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 5,917	$ 5,462	$ 5,153
IAM
Defined Benefit Plan Disclosure [Line Items]
EIN	516031295
Plan Number	2
Pension Protection Act Zone Status	Green	Green
Contributions	269	244	238
Surcharge Imposed	No
Expiration of Collective Bargaining Agreement	Dec. 31, 2013
USW
Defined Benefit Plan Disclosure [Line Items]
EIN	116166763
Plan Number	1
Pension Protection Act Zone Status	Red	Red
FIP/ RP Status Pending/ Implemented	Implemented
Contributions	$ 5,648	$ 5,218	$ 4,915
Surcharge Imposed	Yes
Expiration of Collective Bargaining Agreement	Aug. 31, 2014

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- Definition

Expiration Date of Collective Bargaining Agreement

+ References

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- Definition

Funding Improvement Plan or Rehabilitation Plan

+ References

No definition available.

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X

- Definition

Pension Plan Number

+ References

No definition available.

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- Definition

Pension Protection Act Zone Status

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- Definition

Surcharge Imposed

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No definition available.

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- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

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

-Publisher SEC

-Name Regulation 12B

-Number 240

-Section 12b

-Subsection 1

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- Definition

Amount of contributions made to multiemployer plans for each period for which a statement of income is presented. An employer may disclose total contributions to multiemployer plans without disaggregating the amounts attributable to pension plans and other postretirement benefit plans.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Section 50

-Paragraph 1

-SubTopic 80

-Topic 715

-URI http://asc.fasb.org/extlink&oid=6958064&loc=d3e29142-114947

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