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Income Taxes (Additional Information) (Detail) (USD $)	3 Months Ended		12 Months Ended
Income Taxes (Additional Information) (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes [Line Items]
Statutory rate	15.00%		15.00%
Tax savings due to tax holiday	$ 0	$ 154,000
Expected Future Tax Rate [Member]
Income Taxes [Line Items]
Effective income tax rate	25.00%
Zhengzhou Annec Industrial Co [Member]
Income Taxes [Line Items]
Effective income tax rate	15.00%
Beijing Annec [Member]
Income Taxes [Line Items]
Effective income tax rate	25.00%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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