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Entity Wide Disclosures - Geographic Breakdown of Revenues and Total Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
May. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues $ 222,694 $ 188,121  
Total Assets 784,668   $ 523,833
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues 173,360 138,064  
Total Assets 667,485   399,173
Canada [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues 25,545 32,076  
Total Assets 60,964   68,043
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues 11,816 10,446  
Total Assets 34,942   34,612
Other Foreign Countries [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues 11,973 $ 7,535  
Total Assets $ 21,277   $ 22,005