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Summary of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013
Goodwill [Line Items]
Balance at May 31, 2013	$ 103,466
Acquisitions	5,827
Foreign currency adjustments	(316)
Balance at August 31, 2013	108,977
MS Segment
Goodwill [Line Items]
Balance at May 31, 2013	19,130
Foreign currency adjustments	259
Balance at August 31, 2013	19,389
IHT Segment
Goodwill [Line Items]
Balance at May 31, 2013	53,800
Acquisitions	5,827
Foreign currency adjustments	(318)
Balance at August 31, 2013	59,309
Quest Segment
Goodwill [Line Items]
Balance at May 31, 2013	30,536
Foreign currency adjustments	(257)
Balance at August 31, 2013	$ 30,279

X

- Definition

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.

+ References

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=14024403&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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X

- Definition

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=14024403&loc=d3e13816-109267

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X

- Definition

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=14024403&loc=d3e13816-109267

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