ENTITY WIDE DISCLOSURES - Segment Data for our Three Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended			12 Months Ended
	Sep. 30, 2017		Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Goodwill impairment loss	$ 75,241		$ 0	$ 0	$ 75,241		$ 0	$ 0
Revenues	285,067			289,577	883,877		876,871
Operating income (loss)	(94,116)			(4,043)	(112,897)		2,585
Capital expenditures	7,879			13,926	26,541		35,894
Depreciation and amortization	12,671			12,539	38,686		35,432
TeamQualspec
Segment Reporting Information [Line Items]
Goodwill impairment loss	21,100				21,140
TeamFurmanite
Segment Reporting Information [Line Items]
Goodwill impairment loss	54,100				54,101
Quest Integrity
Segment Reporting Information [Line Items]
Goodwill impairment loss					0
Operating segments | TeamQualspec
Segment Reporting Information [Line Items]
Revenues	138,383			142,529	439,751		436,029
Operating income (loss)	(17,515)	[1]		8,423	1,139	[1]	33,044
Capital expenditures	2,060			1,932	7,424		7,143
Depreciation and amortization	4,806			4,930	14,522		15,035
Operating segments | TeamFurmanite
Segment Reporting Information [Line Items]
Revenues	130,768			131,787	385,154		392,062
Operating income (loss)	(51,154)	[1]		5,983	(45,318)	[1]	25,004
Capital expenditures	3,542			6,308	11,442		12,439
Depreciation and amortization	5,381			5,705	17,041		15,049
Operating segments | Quest Integrity
Segment Reporting Information [Line Items]
Revenues	15,916			15,261	58,972		48,780
Operating income (loss)	(828)			399	7,252		2,863
Capital expenditures	1,197			211	2,470		1,105
Depreciation and amortization	1,065			1,374	3,430		3,940
Corporate and shared support services
Segment Reporting Information [Line Items]
Operating income (loss)	(24,619)			(18,848)	(75,970)		(58,326)
Capital expenditures	1,080			5,475	5,205		15,207
Depreciation and amortization	$ 1,419			$ 530	$ 3,693		$ 1,408

[1] Includes goodwill impairment loss of $21.1 million and $54.1 million for TeamQualspec and TeamFurmanite, respectively, for the three and nine months ended September 30, 2017.