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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 164,981 | $ 177,418
Repair |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 18,316 | 32,808
Distribution |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 80,802 | 78,476
Cost Plus Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 16,551 | 19,681
Fixed Price Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 23,931 | 38,916
T&M Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 25,381 | 7,537
DoD |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 45,888 | 64,134
Other government |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 59,992 | 45,990
Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 59,101 | 67,294
Aviation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 44,371 | 58,080
Aviation | Repair |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 18,316 | 32,808
Aviation | Distribution |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 26,055 | 25,272
Aviation | Cost Plus Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Aviation | Fixed Price Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Aviation | T&M Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Aviation | DoD |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Aviation | Other government |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 25 | 30
Aviation | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 44,346 | 58,050
Fleet |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 54,747 | 53,204
Fleet | Repair |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Fleet | Distribution |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 54,747 | 53,204
Fleet | Cost Plus Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Fleet | Fixed Price Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Fleet | T&M Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Fleet | DoD |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,102 | 4,567
Fleet | Other government |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 37,208 | 39,815
Fleet | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 14,437 | 8,822
Federal and Defense |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 65,863 | 66,134
Federal and Defense | Repair |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Federal and Defense | Distribution |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Federal and Defense | Cost Plus Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 16,551 | 19,681
Federal and Defense | Fixed Price Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 23,931 | 38,916
Federal and Defense | T&M Contract |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 25,381 | 7,537
Federal and Defense | DoD |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 42,786 | 59,567
Federal and Defense | Other government |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 22,759 | 6,145
Federal and Defense | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 318 | $ 422

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