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Summary of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
May 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 40,895 $ 34,989
Accumulated Amortization (9,985) (9,039)
Net Carrying Amount 30,910 25,950
Customer relationships
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,349 21,418
Accumulated Amortization (4,858) (4,168)
Net Carrying Amount 22,491 17,250
Non-compete agreements
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,676 3,701
Accumulated Amortization (3,275) (3,232)
Net Carrying Amount 401 469
Trade names
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4,075 4,075
Accumulated Amortization (487) (424)
Net Carrying Amount 3,588 3,651
Technology
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5,112 5,112
Accumulated Amortization (1,299) (1,166)
Net Carrying Amount 3,813 3,946
Licenses
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 683 683
Accumulated Amortization (66) (49)
Net Carrying Amount $ 617 $ 634