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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 |

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- Definition Lease Expiration, Month and Year + References No definition available. + Details
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- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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