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Business Segments and Customer Information - Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of reportable operating segments | segment |  |  | 3 |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 168,931 | $ 174,164 | $ 516,222 | $ 565,318
Operating income | 15,697 | 12,237 | 41,145 | 41,438
Supply Chain Management Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 51,834 |  | 161,961 |
Aviation Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 34,000 |  | 102,554 |
Federal Services Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 83,097 |  | 251,707 |
Operating Segments | Supply Chain Management Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 51,834 | 51,174 | 161,961 | 163,663
Operating income | 7,783 | 8,178 | 23,547 | 25,611
Operating Segments | Aviation Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 34,000 | 31,059 | 102,554 | 96,003
Operating income | 2,184 | 1,983 | 7,291 | 6,898
Operating Segments | Federal Services Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 83,097 | 91,931 | 251,707 | 305,652
Operating income | 6,186 | 2,593 | 12,270 | 10,503
Corporate, Non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | (456) | $ (517) | $ (1,963) | $ (1,574)
Unspecified Customer One | Federal Services Group | IT service contract |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ 1,700 |  |  |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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