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Segment Data for our Three Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 174,311	$ 161,492
Operating income	8,105	12,824
Capital expenditures	6,223	5,729
Depreciation and amortization	5,383	4,573
Operating Segments | IHT Segment
Segment Reporting Information [Line Items]
Revenues	95,833	82,210
Operating income	10,183	9,659
Capital expenditures	1,845	2,271
Depreciation and amortization	2,082	1,748
Operating Segments | MS Segment
Segment Reporting Information [Line Items]
Revenues	65,769	65,327
Operating income	6,801	7,244
Capital expenditures	1,647	2,787
Depreciation and amortization	1,778	1,709
Operating Segments | Quest Segment
Segment Reporting Information [Line Items]
Revenues	12,709	13,955
Operating income	(696)	3,021
Capital expenditures	1,956	525
Depreciation and amortization	1,325	980
Corporate and Share Support Services
Segment Reporting Information [Line Items]
Operating income	(8,183)	(7,100)
Capital expenditures	775	146
Depreciation and amortization	$ 198	$ 136

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)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ 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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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