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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