RESTRUCTURING AND OTHER RELATED CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	$ 1,877	$ 186
Operating Group Reorganization Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	1,877	0
Professional fees	800
Operating Group Reorganization Program \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	1,877
OneTEAM Program \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net		200
Severance charges incurred cumulatively to date	11,800
IHT \| Operating Group Reorganization Program \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	283	0
MS \| Operating Group Reorganization Program \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	139	0
Quest Integrity \| Operating Group Reorganization Program \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	233	0
Corporate and shared support services \| Operating Group Reorganization Program \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	$ 1,222	$ 0

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of costs incurred to date for the specified restructuring cost.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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