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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

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- 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 + Details
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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 + Details
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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 + Details
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