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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 168,931 | $ 174,164 | $ 516,222 | $ 565,318
Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 44,638 |  | 138,658 |
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 91,220 |  | 273,063 |
Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,073 |  | 104,501 |
U.S. Postal Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43,031 | 43,833 | 130,151 | 136,261
DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 80,002 |  | 249,842 |
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36,027 | 33,470 | 108,631 | 103,976
Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,871 | $ 9,282 | 27,598 | $ 25,636
Supply Chain Management |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 51,834 |  | 161,961 |
Supply Chain Management | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Supply Chain Management | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 51,834 |  | 161,961 |
Supply Chain Management | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Supply Chain Management | U.S. Postal Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43,031 |  | 130,151 |
Supply Chain Management | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,479 |  | 21,180 |
Supply Chain Management | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,324 |  | 10,123 |
Supply Chain Management | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 |  | 507 |
Aviation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34,000 |  | 102,554 |
Aviation | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 |  | 1,098 |
Aviation | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20,152 |  | 59,525 |
Aviation | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13,848 |  | 41,931 |
Aviation | U.S. Postal Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Aviation | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 913 |  | 3,153 |
Aviation | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,641 |  | 98,213 |
Aviation | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 446 |  | 1,188 |
Federal Services Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 83,097 |  | 251,707 |
Federal Services Group | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 44,638 |  | 137,560 |
Federal Services Group | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,234 |  | 51,577 |
Federal Services Group | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,225 |  | 62,570 |
Federal Services Group | U.S. Postal Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Federal Services Group | DoD |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 73,610 |  | 225,509 |
Federal Services Group | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 62 |  | 295 |
Federal Services Group | Other government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 9,425 |  | $ 25,903 |

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