|
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 | [1] | 319,774,660 | 1,403,362,000 | 600,000,000 | [2] | 500,000,000 | 1,350,000,000 | [3] | $ 146,137,476 | 919,774,660 | 3,253,362,000 | [1] | $ 50,807,077 | 319,774,660 | 1,403,362,000 | $ 95,330,399 | [2] | 600,000,000 | [2] | 500,000,000 | 1,350,000,000 | [3] | ||||||
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