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Special Purpose Entities - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Variable Interest Entity [Line Items] |  |  |
Number of natural gas-fired power plant projects under development | 2 |  |
Gains on the deconsolidation of variable interest entities | $ 2,444,000 |  |
Number of joint ventures | 2 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Prospective amount of loan to Moxie Projects, maximum | 10,000,000 |  |
Income attributable to the noncontrolling interest | 77,000 | 1,448,000 | 302,000
Gains on the deconsolidation of variable interest entities | 2,444,000 |  |
Gemma Power Inc [Member] | Panda Liberty LLC [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Cash received from Moxie Project Entities in respect of sale of membership interest to third party investor | 37,863,000 |  |
Cash received from Moxie Project Entities in respect of development success fees | 27,052,000 |  |
Cash received from Moxie Project Entities for repayment of notes receivable and accrued interest | 10,811,000 |  |
Aggregate interest income | $ 952,000 |  |

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