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Capital Commitment and Operating Lease Commitments - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Property
Jun. 30, 2011
Commitments and Contingencies Disclosure [Line Items]        
Number of leased land under non-cancelable operating leases     7  
Purchase obligation $ 13,097,126   $ 13,097,126  
Rent expense related to operating leases 194,450 157,480 388,766 261,488
Extraction Wells, Transmission Channels and Ducts | Second phase enhancement project
        
Commitments and Contingencies Disclosure [Line Items]        
Purchase obligation $ 13,097,126   $ 13,097,126  
Period 1
        
Commitments and Contingencies Disclosure [Line Items]        
Lease expiration date     2021-12  
Period 2
        
Commitments and Contingencies Disclosure [Line Items]        
Lease expiration date     2030-12  
Period 3
        
Commitments and Contingencies Disclosure [Line Items]        
Lease expiration date     2031-12  
Period 4
        
Commitments and Contingencies Disclosure [Line Items]        
Lease expiration date     2040-12  
Period 5
        
Commitments and Contingencies Disclosure [Line Items]        
Lease expiration date     2059-02  
Period 6
        
Commitments and Contingencies Disclosure [Line Items]        
Lease expiration date     2059-08  
Period 7
        
Commitments and Contingencies Disclosure [Line Items]        
Lease expiration date     2060-06