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Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2013 | May 31, 2013
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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

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