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Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Aug. 31, 2013 | Feb. 28, 2013
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Life (in years) | 5 years 9 months 18 days | 6 years 2 months 12 days
Gross Carrying Amount | $ 40,394 | $ 40,394
Accumulated Amortization | 21,211 | 19,621
Amortized intangible assets, net | 19,183 | 20,773
Trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Life (in years) |  |
Gross Carrying Amount | 1,234 | 1,234
Accumulated Amortization | 1,234 | 1,234
Amortized intangible assets, net |  |
Customer lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Life (in years) | 5 years 10 months 24 days | 6 years 4 months 24 days
Gross Carrying Amount | 37,887 | 37,887
Accumulated Amortization | 19,279 | 17,753
Amortized intangible assets, net | 18,608 | 20,134
Noncompete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Life (in years) |  |
Gross Carrying Amount | 500 | 500
Accumulated Amortization | 500 | 500
Amortized intangible assets, net |  |
Patent [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Life (in years) | 4 years 6 months | 5 years
Gross Carrying Amount | 773 | 773
Accumulated Amortization | 198 | 134
Amortized intangible assets, net | $ 575 | $ 639

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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