v2.4.0.6

Held-To-Maturity Securities - Additional Information (Detail) | 12 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Dec. 31, 2009 CNY | Dec. 31, 2011 SZITIC Trust Co Ltd USD ($) | Dec. 31, 2011 SZITIC Trust Co Ltd CNY | Dec. 31, 2011 Held-to-maturity Security SZITIC Trust Co Ltd CNY | Dec. 31, 2011 Held-to-maturity Security SZITIC Trust Co Ltd USD ($) | Dec. 31, 2011 Held-to-maturity Security SZITIC Trust Co Ltd Minimum | Dec. 31, 2011 Held-to-maturity Security SZITIC Trust Co Ltd Maximum
Investment in held to maturity |  |  |  |  |  |  | 100,000,000 | $ 15,888,400 |  |
Expected yield |  |  |  |  |  |  |  | 3.00% | 14.00% | 19.00%
Percentage of total initial trust fund at establishment |  |  |  |  |  |  |  | 60.00% |  |
Impairment of investment |  |  |  |  |  |  | 0 | 0 |  |
Investment maturity period |  |  |  |  |  |  | 5 years | 5 years |  |
Interest income | $ 16,238,410 | 102,202,930 | 136,097,898 | 102,200,467 | $ 313,415 | 1,972,603 |  |  |  |

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- Definition For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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