RESTRUCTURING AND OTHER RELATED CHARGES - Schedule of Restructuring Charges by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	$ 16	$ 1,877
Operating Group Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	16	1,877
Operating Group Reorganization \| Employee Severance \| IHT
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	16	283
Operating Group Reorganization \| Employee Severance \| MS
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	0	139
Operating Group Reorganization \| Employee Severance \| Quest Integrity
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net		233
Operating Group Reorganization \| Employee Severance \| Corporate and shared support services
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges, net	$ 0	$ 1,222

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration