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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
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Product Information [Line Items] |  |  |  |
Revenues | $ 127,564,000 | $ 63,452,000 | $ 280,785,000 | $ 167,964,000
Power Industry Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Revenues | 125,660,000 | 61,103,000 | 275,902,000 | 160,392,000
Core Services [Member] | Power Industry Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Revenues | 125,660,000 | 46,858,000 | 275,902,000 | 146,147,000
Project Development Services [Member] | Power Industry Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Revenues |  | $ 14,245,000 |  | $ 14,245,000

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- Definition Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. + 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration