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Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			$ (114,042)
Other comprehensive income before reclassifications			8,455
Amounts reclassified from AOCI			10,273
Net current period other comprehensive income	15,970	(14,170)	18,728	(5,257)
Balance at June 30, 2013	(95,314)		(95,314)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(81,999)
Other comprehensive income before reclassifications			8,455
Amounts reclassified from AOCI			8,534
Net current period other comprehensive income			16,989
Balance at June 30, 2013	(65,010)		(65,010)
Treasury Lock | Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(31,651)
Amounts reclassified from AOCI			1,729
Net current period other comprehensive income			1,729
Balance at June 30, 2013	(29,922)		(29,922)
Foreign Exchange Contract | Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(392)
Amounts reclassified from AOCI			10
Net current period other comprehensive income			10
Balance at June 30, 2013	$ (382)		$ (382)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

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-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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