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Distribution of Profits - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended
	Apr. 30, 2012	Feb. 28, 2012	Dec. 31, 2012	Dec. 31, 2011
Workers' Compensation Insurance and Reserves [Line Items]
Profit after taxation transferred to general reserve fund			10.00%
Maximum profit after taxation transferred to general reserve fund			50.00%
General reserve fund of PRC subsidiaries			$ 3,573,002	$ 1,590,077
Restricted share capital of PRC subsidiaries			59,715,031	30,476,898
Restricted net assets of PRC subsidiaries			63,288,033	32,066,975
Cash dividend declared		$ 0.28
Dividend distribution	7,856,908
American Depositary Shares
Workers' Compensation Insurance and Reserves [Line Items]
Cash dividend declared		$ 0.14
Variable Interest Entity, Primary Beneficiary
Workers' Compensation Insurance and Reserves [Line Items]
Restricted net assets of PRC subsidiaries			$ 17,620,580	$ 4,978,338

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Legal Reserves

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Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

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Aggregate dividends declared during the period for each share of common stock outstanding.

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 04

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 20

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