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Accrued Environmental Remediation Costs - Additional Information (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accrued Environmental Remediation Costs [Line Items]
Long-term portion of accrued environmental remediation cost	$ 7,299,000	$ 6,327,000

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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