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Revenues and Total Assets in United States and Other Countries (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
May 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 174,311 $ 161,492  
Assets 465,390 460,203 460,203
United States
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 123,805 113,054  
Assets 341,761 334,579  
Canada
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 32,928 35,086  
Assets 64,844 68,164  
Europe
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 8,433 6,700  
Assets 36,268 35,734  
Other Foreign Countries
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 9,145 6,652  
Assets $ 22,517 $ 21,726