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Special Purpose Entities - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Oct. 31, 2014 | Aug. 31, 2014 | Oct. 31, 2014 JointVenture | Oct. 31, 2013 | Oct. 31, 2014 Project JointVenture | Oct. 31, 2013 | Aug. 31, 2014 Moxie Freedom LLC [Member] MW | Oct. 31, 2014 Moxie Freedom LLC [Member] | Nov. 30, 2014 Moxie Freedom LLC [Member] Subsequent Event [Member] | Nov. 30, 2014 Moxie Freedom LLC [Member] Minimum [Member] Subsequent Event [Member] | Oct. 31, 2013 Variable Interest Entity, Primary Beneficiary [Member] | Oct. 31, 2014 Variable Interest Entity, Primary Beneficiary [Member] | Oct. 31, 2013 Variable Interest Entity, Primary Beneficiary [Member]
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 |  |  |  |  |  | $ 2,444,000 |
Investment income interest |  |  |  |  |  |  |  |  |  |  | 259,000 |  | 827,000
Income attributable to the noncontrolling interest |  |  | 4,337,000 | 521,000 | 9,133,000 | 2,351,000 |  |  |  |  |  |  | 101,000
Number of joint ventures |  |  | 2 |  | 2 |  |  |  |  |  |  |  |
Capacity of natural gas-fired power plant |  |  |  |  |  |  | 900 |  |  |  |  |  |
Interest rate on loan receivable | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Development loans to Moxie Freedom |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Notes receivable and accrued interest |  |  |  |  |  |  |  | 1,291,000 |  |  |  |  |
Maturity date of loan |  |  |  |  | Dec. 31, 2017 |  |  |  |  |  |  |  |
Loan approved percentage |  |  |  |  |  |  |  |  | 40.00% |  |  |  |
Cash received from related parties |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
Percentage of development success fee receivable as interest |  |  |  |  |  |  |  |  | 40.00% |  |  |  |
Interest rate on cash received |  |  |  |  |  |  |  |  | 20.00% |  |  |  |

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- Definition Cash Received On Behalf Of Subsidiaries And Variable Interest Entity + References No definition available. + Details
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- Definition Percentage Of Development Success Fee Receivable As Interest + References No definition available. + Details
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- Definition Variable Interest Entity Development Loan Funding Percentage + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4582445-111684 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
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