Description of Business and Summary of Significant Accounting Policies - Summary of Cumulative Catch-Up Adjustments (Details) - Contracts Accounted for under Percentage of Completion - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 25, 2015 |
Sep. 30, 2016 |
Sep. 25, 2015 |
|
| Concentration Risk [Line Items] | ||||
| Favorable adjustments | $ 2,374 | $ 861 | $ 9,238 | $ 6,304 |
| Unfavorable adjustments | (1,202) | (1,212) | (5,036) | (6,784) |
| Net adjustments | $ 1,172 | $ (351) | $ 4,202 | $ (480) |