SEGMENT AND GEOGRAPHIC DISCLOSURES - Segment Data for our Three Operating Segments (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	[1]	$ 874,553	$ 852,539	$ 1,163,314
Operating income (loss)		(125,982)	(217,362)	(2,146)
Capital expenditures	[2]	20,498	17,667	31,734
Depreciation and amortization		41,518	45,908	49,059
IHT
Segment Reporting Information [Line Items]
Revenues		415,371	374,740
MS
Segment Reporting Information [Line Items]
Revenues		378,826	392,484
Quest Integrity
Segment Reporting Information [Line Items]
Revenues		80,356	85,315
Operating Segments | IHT
Segment Reporting Information [Line Items]
Revenues		415,371	374,740	512,950
Operating income (loss)	[3]	12,997	(174,638)	24,084
Capital expenditures	[2]	11,742	3,218	7,983
Depreciation and amortization		12,959	14,891	17,616
Operating Segments | MS
Segment Reporting Information [Line Items]
Revenues		378,826	392,484	535,372
Operating income (loss)		(47,728)	25,879	55,385
Capital expenditures	[2]	3,692	8,767	10,755
Depreciation and amortization		20,500	21,854	21,835
Operating Segments | Quest Integrity
Segment Reporting Information [Line Items]
Revenues		80,356	85,315	114,992
Operating income (loss)		900	16,474	28,757
Capital expenditures	[2]	3,600	3,743	4,550
Depreciation and amortization		2,616	3,587	3,557
Corporate and shared support services
Segment Reporting Information [Line Items]
Operating income (loss)		(92,151)	(85,077)	(110,372)
Capital expenditures	[2]	1,464	1,939	8,446
Depreciation and amortization		$ 5,443	$ 5,576	$ 6,051

[1] Revenues attributable to individual countries/geographic areas are based on the country of domicile of the legal entity that performs the work.

[2] Excludes finance leases. Totals may vary from amounts presented in the consolidated statements of cash flows due to the timing of cash payments.

[3] Includes goodwill impairment loss of $191.8 million for IHT for the year ended December 31, 2020. 2    Includes goodwill impairment loss of $55.8 million for MS for the year ended December 31, 2021. 3    Includes goodwill impairment loss of $8.8 million for Quest for the year ended December 31, 2021.