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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
Segment
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Jun. 30, 2011
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Dec. 31, 2011
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| Summary Of Significant Accounting Policies [Line Items] |
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| Allowance for doubtful accounts |
$ 7,797 |
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$ 7,797 |
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$ 7,757 |
| Depreciation expense |
195,941 |
129,882 |
349,414 |
258,464 |
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| Value added tax rate levied on majority of products |
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17.00% |
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| Minimum likelihood of tax benefits being realized upon settlement |
50.00% |
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50.00% |
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| Number of reportable segments |
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2 |
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Use Rights
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| Summary Of Significant Accounting Policies [Line Items] |
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| Finite lived intangible assets, useful Life |
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50 years |
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| Finite lived intangible assets amortization period |
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2059 |
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| Amortization expense |
$ 16,297 |
$ 15,854 |
$ 32,622 |
$ 31,512 |
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Liaoning Nengfa Weiye Tei Fa Sales Co Ltd
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| Summary Of Significant Accounting Policies [Line Items] |
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| Percentage of equity interests |
99.00% |
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99.00% |
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| Equity interests not consolidated |
1.00% |
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1.00% |
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Minimum
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| Summary Of Significant Accounting Policies [Line Items] |
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| Retention receivable percentage |
5.00% |
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5.00% |
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| Service revenue billing period |
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2 months |
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| Portion of project contract balance withheld period |
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12 months |
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Maximum
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| Summary Of Significant Accounting Policies [Line Items] |
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| Retention receivable percentage |
10.00% |
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10.00% |
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| Service revenue billing period |
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3 months |
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| Portion of project contract balance withheld period |
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24 months |
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