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Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Feb. 28, 2013 | May 31, 2012
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 35,017 | $ 24,166
Accumulated Amortization | (8,118) | (5,658)
Net Carrying Amount | 26,899 | 18,508
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 21,462 | 12,198
Accumulated Amortization | (3,559) | (1,973)
Net Carrying Amount | 17,903 | 10,225
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,719 | 3,136
Accumulated Amortization | (3,164) | (2,844)
Net Carrying Amount | 555 | 292
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,075 | 2,962
Accumulated Amortization | (362) | (207)
Net Carrying Amount | 3,713 | 2,755
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,112 | 5,112
Accumulated Amortization | (1,033) | (634)
Net Carrying Amount | 4,079 | 4,478
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 649 | 758
Net Carrying Amount | $ 649 | $ 758

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