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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 200,582 | $ 165,505 | $ 540,675 | $ 511,638
Repair |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 18,714 | 17,280 | 56,051 | 66,936
Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 114,678 | 82,657 | 282,031 | 247,728
Cost Plus Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 26,775 | 18,194 | 65,139 | 61,182
Fixed Price Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25,729 | 32,937 | 82,090 | 107,932
T&M Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,686 | 14,437 | 55,364 | 27,860
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 94,163 | 48,974 | 218,544 | 156,430
DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 60,862 | 56,935 | 173,501 | 185,956
Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45,557 | 59,596 | 148,630 | 169,252
Aviation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 73,124 | 36,218 | 165,010 | 126,519
Aviation | Repair |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 18,714 | 17,280 | 56,051 | 66,936
Aviation | Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 54,410 | 18,938 | 108,959 | 59,583
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 | 72,542 | 36,075 | 164,353 | 125,295
Aviation | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 104 | 0 | 941
Aviation | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 582 | 39 | 657 | 283
Fleet |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 60,268 | 63,719 | 173,072 | 188,145
Fleet | Repair |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Fleet | Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 60,268 | 63,719 | 173,072 | 188,145
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 | 20,690 | 12,471 | 52,757 | 29,818
Fleet | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,739 | 7,275 | 10,517 | 16,937
Fleet | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36,839 | 43,973 | 109,798 | 141,390
Federal and Defense |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 67,190 | 65,568 | 202,593 | 196,974
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 | 26,775 | 18,194 | 65,139 | 61,182
Federal and Defense | Fixed Price Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25,729 | 32,937 | 82,090 | 107,932
Federal and Defense | T&M Contract |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,686 | 14,437 | 55,364 | 27,860
Federal and Defense | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 931 | 428 | 1,434 | 1,317
Federal and Defense | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 58,123 | 49,556 | 162,984 | 168,078
Federal and Defense | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 8,136 | $ 15,584 | $ 38,175 | $ 27,579

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