Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Sep. 26, 2014
Dec. 31, 2014
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 18, 2014
Sep. 17, 2014
Accounting Policies [Line Items]                                
Number of reportable segments                     1          
Distribution to subsidiary of Exelis $ 136,300,000                   $ 136,281,000 $ 0 $ 0      
Cash and cash equivalents   42,823,000 42,823,000       10,446,000       42,823,000 10,446,000 14,400,000 13,796,000    
Transition services agreement, term (or less)                     1 year          
Increase in operating income due to cumulative catch up adjustments   8,149,000   3,291,000 9,422,000 17,556,000 25,150,000 28,889,000 49,027,000 28,256,000 38,417,000 131,322,000 110,351,000      
Stock-based compensation     2,300,000               2,324,000 0 0      
Vectrus, Inc.                                
Accounting Policies [Line Items]                                
Common stock, distribution basis for issued and outstanding shares                             0.0556  
Minimum                                
Accounting Policies [Line Items]                                
Transition services agreement, term (or less)                     3 months          
Maximum                                
Accounting Policies [Line Items]                                
Transition services agreement, term (or less)                     24 months          
Term Loan | Term Facility                                
Accounting Policies [Line Items]                                
Distribution to subsidiary of Exelis 136,300,000                              
Credit facility, maximum borrowing capacity                               $ 140,000,000
Buildings and improvements | Minimum                                
Accounting Policies [Line Items]                                
Estimated useful life                     5 years          
Buildings and improvements | Maximum                                
Accounting Policies [Line Items]                                
Estimated useful life                     40 years          
Machinery and equipment | Minimum                                
Accounting Policies [Line Items]                                
Estimated useful life                     3 years          
Machinery and equipment | Maximum                                
Accounting Policies [Line Items]                                
Estimated useful life                     10 years          
Furniture, fixtures, and office equipment | Minimum                                
Accounting Policies [Line Items]                                
Estimated useful life                     3 years          
Furniture, fixtures, and office equipment | Maximum                                
Accounting Policies [Line Items]                                
Estimated useful life                     7 years