Assets Held For Sale and Discontinued Operations - Schedule of Assets and Liabilities Held For Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets held for sale:
Total Current assets held for sale	$ 26,688	$ 29,773
Noncurrent assets held for sale:
Total Noncurrent assets held for sale	51,025	28,273
Current liabilities held for sale:
Total Current liabilities held for sale	17,609	12,263
Noncurrent liabilities held for sale:
Total Noncurrent liabilities held for sale	1,970	4,551
Discontinued Operations, Held-for-sale | GS segment
Current assets held for sale:
Trade receivables	21,403	24,336
Prepaid expenses and other current assets	5,285	5,437
Total Current assets held for sale	26,688	29,773
Noncurrent assets held for sale:
Fixed assets, net	1,354	1,496
Other assets, net	1,559	293
Deferred tax assets, net	20,518	2,604
Intangible assets, net	2,866	2,952
Goodwill	20,928	20,928
Total Noncurrent assets held for sale	47,225	28,273
Current liabilities held for sale:
Accounts payable and other accrued liabilities	11,727	6,064
Accrued payroll costs	5,192	5,878
Current portion of operating lease liabilities	682	0
Other current liabilities	8	16
Income taxes payable	0	305
Total Current liabilities held for sale	17,609	12,263
Noncurrent liabilities held for sale:
Other long-term liabilities	1,970	4,551
Total Noncurrent liabilities held for sale	1,970	$ 4,551
Discontinued Operations, Held-for-sale | Other Disposals
Noncurrent assets held for sale:
Fixed assets, net	$ 3,800