Receivables - Schedule of Receivables (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Billed receivables $ 41,997,000 $ 68,508,000
Unbilled contract receivables 160,735,000 159,026,000
Receivables 202,732,000 227,534,000
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Exelis indemnified receivable obligation 11,411,000 0
Estimated unbilled contract receivables related to requests for equitable adjustments and contract line item realignments 4,800,000  
Other accrued liabilities | Indemnified Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Exelis indemnified receivable obligation $ 11,400,000