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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

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