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Entity Wide Disclosures - Segment Data for our Three Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 222,694	$ 188,121
Operating income	4,449	11,825
Capital expenditures	11,218	5,468
Depreciation and amortization	7,884	5,529
Operating Segments [Member] | IHT Segment [Member]
Segment Reporting Information [Line Items]
Revenues	136,767	105,594
Operating income	12,527	12,287
Capital expenditures	3,333	1,539
Depreciation and amortization	3,441	2,001
Operating Segments [Member] | MS Segment [Member]
Segment Reporting Information [Line Items]
Revenues	68,358	67,846
Operating income	3,631	6,704
Capital expenditures	2,439	1,180
Depreciation and amortization	2,125	1,864
Operating Segments [Member] | Quest Integrity [Member]
Segment Reporting Information [Line Items]
Revenues	17,569	14,681
Operating income	1,745	767
Capital expenditures	1,238	796
Depreciation and amortization	1,441	1,405
Corporate and shared support services [Member]
Segment Reporting Information [Line Items]
Operating income	(13,454)	(7,933)
Capital expenditures	4,208	1,953
Depreciation and amortization	$ 877	$ 259

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (b)



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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Investing Activities



-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 230



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-Section 45



-Paragraph 13



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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



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