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Short-term Investments (Detail) | Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Aug. 31, 2009 Held-to-maturity Security Investment Contracts New China Trust CNY | Dec. 31, 2011 Carrying (Reported) Amount, Fair Value Disclosure Held-to-maturity Security CNY | Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure Held-to-maturity Security CNY | Dec. 31, 2011 Carrying (Reported) Amount, Fair Value Disclosure Held-to-maturity Security Fixed Rate Time Deposits CNY | Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure Held-to-maturity Security Fixed Rate Time Deposits CNY | Dec. 31, 2011 Carrying (Reported) Amount, Fair Value Disclosure Held-to-maturity Security Investment Contracts China Railway Trust CNY | Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure Held-to-maturity Security Investment Contracts New China Trust CNY | Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure Held-to-maturity Security Investment Contracts Shanghai Lingang And Anhu iHailuo CNY | Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security USD ($) | Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security CNY | Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security CNY | Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security Fixed Rate Time Deposits USD ($) | Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security Fixed Rate Time Deposits CNY | Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security Fixed Rate Time Deposits CNY | Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security Investment Contracts China Railway Trust USD ($) | Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security Investment Contracts China Railway Trust CNY | Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security Investment Contracts New China Trust CNY | Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure Held-to-maturity Security Investment Contracts Shanghai Lingang And Anhu iHailuo CNY
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments | $ 146,137,476 | 919,774,660 | 3,253,362,000 | 500,000,000 | 919,774,660 | 3,253,362,000 | 319,774,660 | 1,403,362,000 | 600,000,000 | [1] | 500,000,000 | [2] | 1,350,000,000 | [3] | $ 146,137,476 | 919,774,660 | 3,253,362,000 | $ 50,807,077 | 319,774,660 | 1,403,362,000 | $ 95,330,399 | [1] | 600,000,000 | [1] | 500,000,000 | [2] | 1,350,000,000 | [3]
[1] | During November 2011, the Company made an investment in China Railway Trust (the "Trust"), an affiliate of state owned China Railway Group Limited, of RMB 600,000,000 (US$95,330,399), which was used to fund a short-term loan provided from the Trust to Zhonghang Wanke Co., Ltd. ("Zhonghang Wanke"), a large scale commercial and residential real estate development company with operations throughout the P.R.C., with an annual interest rate of 13% and a maturity term of one year. This short-term investment is in a real estate project of Zhonghang Wanke, which excluding management fees charged by the Trust, is expected to yield a net return to the Company of 9.1%. The principal and interest of the investment loan are collateralized by a certain land use right and any associated construction-in-progress. The Company has accounted for this investment loan as a short-term held-to-maturity investment in accordance with ASC 320-10 at its amortized cost. There was no impairment indicators associated with this held-to-maturity investment at December 31, 2011.
[2] | On August 21, 2009, the Group entered into a two year investment contract amounting to RMB500,000,000 with a fixed quarterly yield of 1.5% (6% per annum) with new China Trust. The investment contract is secured by 45,040,000 A-shares of Shanghai Pudong Development Bank ("PDB"), a company listed on the Shanghai Stock Exchange. Management has accounted for this investment as short-term investment held-to-maturity in accordance with ASC 320-10 at amortized cost adjusted for any related premiums (discounts) over the estimated remaining period until maturity. There was no impairment indicators present associated with these investment contracts at December 31, 2010. Proceeds with respect to this investment have been received by the Group on the maturity date of August 21, 2011.
[3] | On December 24, 2010, the Company entered into investment contracts with Shanghai Lingang and Anhui Hailuo amounting to RMB850,000,000 and RMB500,000,000, respectively, with fixed interests of 4.0% and 4.2% per annum, respectively and maturity of 150 days and 157 days, respectively. The principal amounts of the Shanghai Lingang and Anhui Hailuo investment contracts are wholly guaranteed by China Minsheng Banking Corp. Ltd, a company that is listed on both the Shanghai and Hong Kong Stock Exchange. Management has accounted for these investment contracts as short-term investments held-to-maturity in accordance with ASC 320-10 at amortized cost adjusted for any related premiums (discounts) over the estimated remaining period until maturity. There was no impairment indicators present associated with these investment contracts at December 31, 2010. Proceeds with respect to these investments have been received by the Group on May 30, 2011.

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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 1 -Subparagraph g Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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