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Special Purpose Entities - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended |  | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 Project | Oct. 31, 2012 | Apr. 30, 2013 Moxie Liberty LLC [Member] | Jul. 31, 2013 Moxie Patriot LLC [Member] | Oct. 31, 2013 Moxie Patriot LLC [Member] | Oct. 31, 2013 Moxie Patriot LLC [Member] Notes Receivable [Member] | Oct. 31, 2013 Moxie Patriot LLC [Member] Accrued Interest Receivable on Notes [Member] | Oct. 31, 2012 Variable Interest Entity, Primary Beneficiary [Member] | Oct. 31, 2013 Variable Interest Entity, Primary Beneficiary [Member] | Oct. 31, 2012 Variable Interest Entity, Primary Beneficiary [Member] | Aug. 31, 2013 Gemma Power Inc [Member] Panda Liberty LLC [Member] | Oct. 31, 2013 Joint Venture [Member] | Oct. 31, 2013 Joint Venture [Member]
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of natural gas-fired power plant projects under development |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Prospective amount of loan to Moxie Projects, maximum |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Income attributable to the noncontrolling interest |  |  |  |  |  |  |  |  |  | 369,000 | 101,000 | 783,000 |  | 521,000 | 601,000
Cash received from Panda Liberty in respect of sale of membership interest to third party investor |  |  |  |  |  |  |  |  |  |  |  |  | 19,373,000 |  |
Cash received from Panda Liberty in respect of development success fees |  |  |  |  |  |  |  |  |  |  |  |  | 14,245,000 |  |
Cash received from Panda Liberty for repayment of notes receivable and accrued interest |  |  |  |  |  |  |  |  |  |  |  |  | 5,128,000 |  |
Gains on the deconsolidation of variable interest entities |  |  | 2,444,000 |  | 1,120,000 | 1,324,000 |  |  |  |  |  |  |  |  |
Note receivable from Moxie Patriot |  |  |  |  |  |  |  | 4,498,000 | 937,000 |  |  |  |  |  |
Company's amount of maximum exposure to loss |  |  |  |  |  |  | 5,435,000 |  |  |  |  |  |  |  |
Revenue from consolidated joint venture as to consolidated net revenue description | $ 63,452,000 | $ 74,486,000 | $ 167,964,000 | $ 220,794,000 |  |  |  |  |  |  |  |  |  | $ 17,486,000 | $ 20,589,000

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