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Restructuring Activities - Additional Information (Detail) (Green River Victorville Facilities, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Green River Victorville Facilities
Restructuring Cost and Reserve [Line Items]
Company's investment in capital expenditure	$ 26.5	$ 11.0
Total capital expenditure	37.5
Accelerated depreciation expense in cost of sales	0.7	2.3
Transition costs recorded in cost of sales	$ 2.1	$ 1.2

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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