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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
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%