Accounts Receivable (Details) (USD $)	Mar. 28, 2013	Dec. 31, 2012
Accounts Receivable, Net
Trade receivables	$ 579,400,000	$ 415,900,000
Other	8,400,000	9,100,000
Less: allowance for doubtful accounts	(500,000)	(4,300,000)
Accounts receivable, net	587,300,000	420,700,000
Unbilled Contracts Receivable	26,500,000	25,600,000
Accounts receivable held in retainage by customer	103,800,000	102,000,000
Receivables due from Hawker		$ 3.5