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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 175,112 | $ 168,715 | $ 340,093 | $ 346,133
Repair |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,021 | 16,848 | 37,337 | 49,656
Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 86,551 | 86,595 | 167,353 | 165,071
Cost Plus Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 21,813 | 23,307 | 38,364 | 42,988
Fixed Price Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,430 | 36,079 | 56,361 | 74,995
T&M Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,297 | 5,886 | 40,678 | 13,423
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 65,280 | 40,162 | 124,381 | 107,456
DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 66,751 | 64,887 | 112,639 | 129,021
Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43,081 | 63,666 | 103,073 | 109,656
Aviation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47,515 | 32,221 | 91,886 | 90,301
Aviation | Repair |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,021 | 16,848 | 37,337 | 49,656
Aviation | Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,494 | 15,373 | 54,549 | 40,645
Aviation | Cost Plus Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Aviation | Fixed Price Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Aviation | T&M Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Aviation | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47,465 | 31,170 | 91,811 | 89,220
Aviation | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 837 | 0 | 837
Aviation | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 50 | 214 | 75 | 244
Fleet |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 58,057 | 71,222 | 112,804 | 124,426
Fleet | Repair |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Fleet | Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 58,057 | 71,222 | 112,804 | 124,426
Fleet | Cost Plus Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Fleet | Fixed Price Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Fleet | T&M Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Fleet | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,630 | 8,525 | 32,067 | 17,347
Fleet | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,676 | 5,095 | 7,778 | 9,662
Fleet | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35,751 | 57,602 | 72,959 | 97,417
Federal and Defense |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 69,540 | 65,272 | 135,403 | 131,406
Federal and Defense | Repair |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Federal and Defense | Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Federal and Defense | Cost Plus Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 21,813 | 23,307 | 38,364 | 42,988
Federal and Defense | Fixed Price Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,430 | 36,079 | 56,361 | 74,995
Federal and Defense | T&M Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,297 | 5,886 | 40,678 | 13,423
Federal and Defense | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 185 | 467 | 503 | 889
Federal and Defense | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 62,075 | 58,955 | 104,861 | 118,522
Federal and Defense | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 7,280 | $ 5,850 | $ 30,039 | $ 11,995

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