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Discontinued Operations - Summary of Pretax Profit (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
(Loss) gain on sale of discontinued operations |  |  | $ 79,602 | $ 0
(Loss) income from discontinued operations, net of tax | $ (967) | $ 2,021 | 76,697 | 4,338
Discontinued Operations, Disposed of by Sale | GS segment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue | 0 | 28,868 | 27,737 | 86,809
Direct costs | 0 | 20,532 | 19,494 | 63,531
Gross profit | 0 | 8,336 | 8,243 | 23,278
Selling, general and administrative expenses | 0 | 5,373 | 6,842 | 16,702
Depreciation and amortization | 0 | 248 | 307 | 749
Income from discontinued operations | 0 | 2,715 | 1,094 | 5,827
(Loss) gain on sale of discontinued operations | (402) | 0 | 79,602 | 0
Other income (expense), net | 0 | 8 | (436) | 0
(Loss) income from discontinued operations, before income taxes | (402) | 2,723 | 80,260 | 5,827
Income tax expense | 565 | 702 | 3,563 | 1,489
(Loss) income from discontinued operations, net of tax | $ (967) | $ 2,021 | $ 76,697 | $ 4,338

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