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Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Balance at the beginning of the period	$ 48,006
Additions charged to expense, net	1,228
Payments, net	(745)
Balance at the end of the period	48,489
Amounts recognized in the Condensed Consolidated Balance Sheet at the end of the period:
Current liability	5,115	5,667
Noncurrent liability	43,374	42,339
Total	$ 48,489

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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The aggregate amount disbursed during the reporting period to settle environmental loss contingencies.

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The amount added to the accrual for newly incurred environmental loss contingencies. These additions include remediation expense and interest accretion. These additions do not relate to changes in the environmental accrual related to a business acquisition or divestiture, to currency movements, or revisions in previously existing estimates.

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