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Commitments - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended |  | 1 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended |  | 1 Months Ended
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Jun. 30, 2012 USD ($) | Dec. 31, 2011 USD ($) | Mar. 05, 2010 Xi'an TCH | Jan. 20, 2010 Xi'an TCH MW | Jun. 30, 2012 Xi'an TCH USD ($) | Jun. 30, 2011 Xi'an TCH USD ($) | Jun. 30, 2012 Xi'an TCH USD ($) | Jun. 30, 2011 Xi'an TCH USD ($) | Jun. 30, 2012 Xi'an TCH CNY | Mar. 05, 2010 Xi'an TCH Monthly payment USD ($) | Jun. 30, 2012 ShangHai TCH USD ($) | Jun. 30, 2011 ShangHai TCH USD ($) | Jun. 30, 2012 ShangHai TCH USD ($) | Jun. 30, 2011 ShangHai TCH USD ($) | Jun. 30, 2012 ShangHai TCH Monthly payment USD ($) | Apr. 30, 2009 Erdos TCH signed with Metallurgy USD ($) Phase MW | Apr. 30, 2009 Erdos TCH signed with Metallurgy CNY Phase MW | Apr. 18, 2009 Erdos TCH signed with Metallurgy USD ($) Phase MW | Apr. 18, 2009 Erdos TCH signed with Metallurgy CNY | Apr. 30, 2009 Erdos TCH signed with Metallurgy Maximum MW | Apr. 18, 2009 Erdos TCH signed with Metallurgy Maximum MW | Apr. 30, 2009 Erdos TCH signed with Metallurgy Minimum USD ($) | Apr. 30, 2009 Erdos TCH signed with Metallurgy Minimum CNY | Mar. 31, 2010 Erdos TCH signed with Metallurgy Phase I | Apr. 30, 2009 Erdos TCH signed with Metallurgy Phase I MW Property | Apr. 18, 2009 Erdos TCH signed with Metallurgy Phase I MW Property | Apr. 30, 2009 Erdos TCH signed with Metallurgy Phase II MW Property | Apr. 18, 2009 Erdos TCH signed with Metallurgy Phase II MW Property | Apr. 30, 2009 Erdos TCH signed with Metallurgy steam per hour ton | Apr. 30, 2009 Erdos TCH signed with Metallurgy Phase III MW Property | Apr. 18, 2009 Erdos TCH signed with Metallurgy Phase III MW Property | Jun. 30, 2012 Erdos TCH signed with Metallurgy Phase III USD ($) | Dec. 31, 2011 Erdos TCH signed with Metallurgy Phase III USD ($) | Apr. 18, 2009 Maintenance And Operations Outsourcing USD ($) | Apr. 18, 2009 Maintenance And Operations Outsourcing CNY | Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co USD ($) MW | Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co CNY | Jun. 30, 2012 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co USD ($) | Dec. 31, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co USD ($) | Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co Project One MW Property | Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co Project Two MW Property | Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co Project Three MW Property
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease term |  |  | 2 years |  |  |  |  |  |  |  |  |  | 1 year |  |  | 20 years | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years | 30 years |  |  |  |  |
Operating lease expiry date |  |  | Mar. 04, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly rental payment |  |  |  |  |  |  |  |  |  | $ 16,360 |  |  |  |  | $ 260 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental expense |  |  |  |  | 50,250 | 50,250 | 100,507 | 99,191 |  |  | 809 | 780 | 1,609 | 780 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in monthly rental payment |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future minimum rental payments required under operating leases for 2013 | 215,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  | 70 | 70 | 70 | 70 | 120 | 120 |  |  |  | 18 | 18 | 27 | 27 | 30 | 25 | 25 |  |  |  |  | 23 | 23 |  |  | 3 | 15 | 1
Estimated total investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,000,000 | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of phases of construction of power generation system |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power generation system |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 3 | 3 |  | 1 | 1 |  |  |  |  |  |  |  |  | 2 | 1 | 2
Minimum monthly payment for each 9MW power generation system |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 220,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Completion date of facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | March of 2010 |  | During the first quarter of 2010 |  | Fourth quarter of 2010 and first quarter of 2011 |  |  |  | End of 2012 |  |  |  |  |  |  |  |  |  |
Yearly cost of operation and maintenance of each power generation system |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 922,000.00 | 6,270,000 |  |  |  |  |  |  |
Construction in progress | 32,542,628 | 32,466,242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,720,000 | 19,770,000 |  |  |  |  | 12,830,000 | 12,700,000 |  |  |
Estimated additional construction cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,740,000 |  |  |  |  |  | 15,630,000 |  |  |  |
Quality deposit |  |  |  |  | 334,388 |  | 334,388 |  | 2,125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000 |  |  |  |  |  |  |  |  |  |
Construction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 79,000,000 | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,450,000 | 180,000,000 |  |  |  |  |

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