Discontinued Operations - Schedule of Assets and Liabilities Held For Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets held for sale:
Total Current assets held for sale	$ 0	$ 29,773
Noncurrent assets held for sale:
Total Noncurrent assets held for sale	0	28,273
Current liabilities held for sale:
Total Current liabilities held for sale	0	12,263
Noncurrent liabilities held for sale:
Total Noncurrent liabilities held for sale	$ 0	4,551
Discontinued Operations, Held-for-sale | GS segment
Current assets held for sale:
Trade receivables		24,336
Prepaid expenses and other current assets		5,437
Total Current assets held for sale		29,773
Noncurrent assets held for sale:
Fixed assets, net		1,496
Other assets, net		293
Deferred tax assets, net		2,604
Intangible assets		2,952
Goodwill		20,928
Total Noncurrent assets held for sale		28,273
Current liabilities held for sale:
Accounts payable and other accrued liabilities		6,064
Accrued payroll costs		5,878
Other current liabilities		16
Income taxes payable		305
Total Current liabilities held for sale		12,263
Noncurrent liabilities held for sale:
Other long-term liabilities		4,551
Total Noncurrent liabilities held for sale		$ 4,551