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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 198,326 | $ 168,931 | $ 557,356 | $ 516,222
Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42,006 | 44,638 | 103,723 | 138,658
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 100,715 | 91,220 | 294,236 | 273,063
Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,605 | 33,073 | 159,397 | 104,501
USPS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42,282 | 43,031 | 127,077 | 130,151
DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 85,053 | 80,002 | 222,834 | 249,842
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 62,854 | 36,027 | 175,589 | 108,631
Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,137 | 9,871 | 31,856 | 27,598
Supply Chain Management |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,369 | 51,834 | 160,878 | 161,961
Supply Chain Management | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Supply Chain Management | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,369 | 51,834 | 160,878 | 161,961
Supply Chain Management | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Supply Chain Management | USPS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42,282 | 43,031 | 127,077 | 130,151
Supply Chain Management | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,935 | 5,479 | 18,238 | 21,180
Supply Chain Management | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,015 | 3,324 | 15,085 | 10,123
Supply Chain Management | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 137 | 0 | 478 | 507
Aviation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 59,186 | 34,000 | 163,553 | 102,554
Aviation | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 315 | 0 | 696 | 1,098
Aviation | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 26,268 | 20,152 | 75,260 | 59,525
Aviation | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,603 | 13,848 | 87,597 | 41,931
Aviation | USPS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Aviation | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,613 | 913 | 2,768 | 3,153
Aviation | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 56,839 | 32,641 | 159,400 | 98,213
Aviation | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 734 | 446 | 1,385 | 1,188
Federal Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 83,771 | 83,097 | 232,925 | 251,707
Federal Services | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 41,691 | 44,638 | 103,027 | 137,560
Federal Services | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,078 | 19,234 | 58,098 | 51,577
Federal Services | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 23,002 | 19,225 | 71,800 | 62,570
Federal Services | USPS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Federal Services | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 76,505 | 73,610 | 201,828 | 225,509
Federal Services | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 62 | 1,104 | 295
Federal Services | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 7,266 | $ 9,425 | $ 29,993 | $ 25,903

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