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Description of the Business and Basis of Presentation - Schedule of Net Revenues by Service Category (Detail) (USD $) | 3 Months Ended | 9 Months Ended
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Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 | Oct. 31, 2012
Product Information [Line Items] |  |  |  |
Net revenues | $ 63,452,000 | $ 74,486,000 | $ 167,964,000 | $ 220,794,000
Power Industry Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net revenues | 61,103,000 | 70,527,000 | 160,392,000 | 206,364,000
Core Services [Member] | Power Industry Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net revenues | 46,858,000 | 70,527,000 | 146,147,000 | 206,364,000
Project Development Services [Member] | Power Industry Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net revenues | $ 14,245,000 |  | $ 14,245,000 |

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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