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Summary of Significant Accounting Policies and Practices - Schedule of Roll Forward Goodwill (Detail)
$ in Thousands
 3 Months Ended
Aug. 31, 2015
USD ($)
Goodwill [Line Items]  
Balance at beginning of period $ 107,773
Acquisitions 155,792
Foreign currency adjustments (1,371)
Balance at end of Period 262,194
MS Segment [Member]  
Goodwill [Line Items]  
Balance at beginning of period 17,466
Acquisitions 4,060
Foreign currency adjustments 171
Balance at end of Period 21,697
IHT Segment [Member]  
Goodwill [Line Items]  
Balance at beginning of period 60,737
Acquisitions 151,732
Foreign currency adjustments (960)
Balance at end of Period 211,509
Quest Integrity [Member]  
Goodwill [Line Items]  
Balance at beginning of period 29,570
Foreign currency adjustments (582)
Balance at end of Period $ 28,988