Summary of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Feb. 28, 2015
Goodwill [Line Items]
Balance at beginning of year	$ 113,763us-gaap_Goodwill
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency adjustments	(5,578)us-gaap_GoodwillTranslationAdjustments
Balance at end of year	108,185us-gaap_Goodwill
MS Segment
Goodwill [Line Items]
Balance at beginning of year	19,685
Acquisitions	0
Foreign currency adjustments	(2,120)
Balance at end of year	17,565
IHT Segment
Goodwill [Line Items]
Balance at beginning of year	63,249
Acquisitions	0
Foreign currency adjustments	(2,568)
Balance at end of year	60,681
Quest Integrity
Goodwill [Line Items]
Balance at beginning of year	30,829
Acquisitions	0
Foreign currency adjustments	(890)
Balance at end of year	$ 29,939

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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