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Business Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Segment Reporting Information [Line Items]
Equity income from unconsolidated subsidiaries	$ 385	$ 1,274	$ 827	$ 1,479
Transportation [Member]
Segment Reporting Information [Line Items]
Equity income from unconsolidated subsidiaries	400	1,300	800	1,500
Federal [Member]
Segment Reporting Information [Line Items]
Equity income from unconsolidated subsidiaries

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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