XML 59 R44.htm IDEA: XBRL DOCUMENT v3.3.1.900
Description of Business and Summary of Significant Accounting Policies - Revenue Recognition (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 25, 2015
USD ($)
Jun. 26, 2015
USD ($)
Mar. 27, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Concentration Risk [Line Items]                      
Number of contracts exceeding threshold | contract                 4    
Contracts revenue $ 311,194 $ 299,061 $ 309,509 $ 260,920 $ 285,765 $ 300,651 $ 312,902 $ 303,951 $ 1,180,684 $ 1,203,269 $ 1,511,638
Sales Revenue, Net | U.S. Army | Government Contracts Concentration Risk                      
Concentration Risk [Line Items]                      
Concentration risk                 85.00% 88.00% 92.00%
Four Largest Contracts | Sales Revenue, Net | U.S. Army | Government Contracts Concentration Risk                      
Concentration Risk [Line Items]                      
Concentration risk                 66.00% 68.00% 69.00%
Contracts revenue                 $ 775,400 $ 822,000 $ 1,000,000