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Restructuring and Other Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013 Federal [Member]	Mar. 31, 2013 Transportation [Member]	Mar. 31, 2013 Selling General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 602	$ 300	$ 300	$ 600

- 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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