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Summary of Significant Accounting Policies - Schedule of Net Revenues by Service Category (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 59,491,000 | $ 63,452,000 | $ 57,864,000 | $ 46,648,000 | $ 57,840,000 | $ 74,486,000 | $ 82,619,000 | $ 63,690,000 | $ 227,455,000 | $ 278,635,000 | $ 141,850,000
Power Industry Services [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 218,649,000 | 261,327,000 | 132,519,000
Core Services [Member] | Power Industry Services [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 191,597,000 | 261,327,000 | 132,519,000
Project Development Services [Member] | Power Industry Services [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 27,052,000 |  |

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- Definition No authoritative reference available. + 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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