ACQUISITIONS AND DIVESTITURES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets and Liabilities Held for Sale [Line Items]
Loss on assets held-for-sale	$ 11,516	$ (960)
Total assets held for sale	7,412		$ 7,835
Total liabilities held for sale	1,481		$ 1,322
Business Unit From Customer Growth Services And Customer Strategy Services Segments | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets and Liabilities Held for Sale [Line Items]
Accounts receivable, net - assets held for sale	5,834
Other assets held for sale	230
Property, Plant and Equipment - assets held for sale	58
Goodwill - assets held for sale	3,033
Allowance for reduction of assets held for sale	(2,700)
Total assets held for sale	7,412
Accounts payable held for sale	495
Accrued employee compensation and benefits	931
Accrued expenses.	44
Other liabilities held for sale	11
Total liabilities held for sale	1,481
Business Unit From Customer Growth Services And Customer Strategy Services Segments | Disposal Group, Held-for-sale, Not Discontinued Operations | Customer Relationships [Member]
Assets and Liabilities Held for Sale [Line Items]
Intangible assets held for sale	$ 957