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Equity Income from Unconsolidated Subsidiaries - Summary of Financial Information for the Unconsolidated Subsidiary (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Dec. 31, 2012
Equity Method Investments And Joint Ventures [Abstract]
Contract revenue earned	$ 2.5	$ 5.7	$ 4.9	$ 8.0
Gross profit	1.3	3.9	2.6	4.4
Net income	1.3	3.9	2.6	4.4
Total assets	2.3		2.3		5.9
Total liabilities	$ 2.3		$ 2.3		$ 5.3

The amount of current assets reported by an equity method investment of the entity.

The amount of current liabilities reported by an equity method investment of the entity.

The amount of gross profit (loss) reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.