SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Schedule of Rollforward Goodwill (Detail) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016
Goodwill [Roll Forward]
Balance at beginning of period	$ 107,773	$ 256,654
Acquisitions	150,965	99,738
Foreign currency adjustments	(2,084)	(606)
Balance at end of period	256,654	355,786
TeamQualspec
Goodwill [Roll Forward]
Balance at beginning of period	60,737	207,497
Acquisitions	148,482	5,955
Foreign currency adjustments	(1,722)	23
Balance at end of period	207,497	213,475
TeamFurmanite
Goodwill [Roll Forward]
Balance at beginning of period	17,466	19,874
Acquisitions	2,483	89,646
Foreign currency adjustments	(75)	(461)
Balance at end of period	19,874	109,059
Quest Integrity
Goodwill [Roll Forward]
Balance at beginning of period	29,570	29,283
Acquisitions	0	4,137
Foreign currency adjustments	(287)	(168)
Balance at end of period	$ 29,283	$ 33,252