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Convertible Notes Payable and Revolving Financing Agreement - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Dec. 09, 2011
Jan. 31, 2011
USD ($)
Jan. 31, 2011
CNY
Dec. 31, 2010
USD ($)
Dec. 31, 2010
CNY
Aug. 18, 2010
Aug. 18, 2008
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Dec. 31, 2011
USD ($)
Aug. 18, 2008
Maximum
USD ($)
Dec. 31, 2011
Maximum
Dec. 31, 2010
Maximum
Dec. 09, 2011
First
CNY
Dec. 09, 2011
Second
CNY
Apr. 29, 2009
8% Secured Convertible Promissory Note
USD ($)
Jun. 30, 2011
Second Note
USD ($)
Apr. 29, 2009
Second Note
USD ($)
Apr. 29, 2008
Second Note
5% Secured Convertible Promissory Note
USD ($)
Dec. 09, 2011
Cancelled
CNY
Dec. 31, 2011
Xi'an TCH
USD ($)
Dec. 31, 2011
Xi'an TCH
CNY
Dec. 16, 2011
Xi'an TCH
USD ($)
Dec. 16, 2011
Xi'an TCH
CNY
Jun. 30, 2012
Xi'an TCH
USD ($)
Jun. 30, 2012
Xi'an TCH
USD ($)
Mar. 31, 2012
Xi'an TCH
USD ($)
Mar. 31, 2012
Xi'an TCH
CNY
Dec. 09, 2011
Xi'an TCH
First
USD ($)
Dec. 09, 2011
Xi'an TCH
First
Minimum
Dec. 09, 2011
Xi'an TCH
Second
USD ($)
Dec. 09, 2011
Xi'an TCH
Second
Minimum
Dec. 09, 2011
Chief Executive Officer
Aug. 18, 2010
Chief Executive Officer
First Note
Aug. 18, 2010
Chief Executive Officer
Second Note
Nov. 16, 2007
Notes Purchase Agreement
USD ($)
Nov. 16, 2007
Notes Purchase Agreement
First Note
10% Secured Convertible Promissory Note
USD ($)
Aug. 18, 2010
Notes Purchase Agreement
If the Loans under the Trust Loan Agreement do not occur
Tranche One
CNY
Aug. 18, 2010
Notes Purchase Agreement
If the Loans under the Trust Loan Agreement do not occur
Tranche Two
CNY
Jun. 28, 2012
Convertible Promissory Note Transfer Agreement
Secured Promissory Note
USD ($)
May 31, 2012
Convertible Promissory Note Transfer Agreement
CAGP
Great Essential Investment Ltd
USD ($)
Jun. 28, 2012
Convertible Promissory Note Transfer Agreement
CAGP
Secured Promissory Note
USD ($)
Aug. 18, 2010
China Cinda (HK) Asset Management Co., Ltd
Notes Purchase Agreement
Aug. 18, 2010
China Cinda (HK) Asset Management Co., Ltd
Notes Purchase Agreement
Tranche One
CNY
Aug. 18, 2010
China Cinda (HK) Asset Management Co., Ltd
Notes Purchase Agreement
Tranche Two
CNY
Aug. 18, 2010
China Jingu International Trust Co. Ltd.
Capital Trust Loan Agreement
CNY
Debt Instrument [Line Items]                                                                                                
Secured convertible promissory note issued                                   $ 3,000,000     $ 5,000,000     25,000,000         $ 4,743,158 30,000,000                 $ 5,000,000                  
Common stock issuable (in shares)                                                                           4,065,040                    
Common stock issuable                                                                           5,000,000                    
Common stock issuable, price per share                                                                           $ 1.23                    
Debt instrument maturity date                                   Apr. 29, 2012     Apr. 29, 2011                                                      
Conversion term             Each Note has a conversion price at the lower of (i) US$2.46 per share or (ii) an amount equal to the Company's EPS based upon the consolidated earnings of the Company for 2010 on a weighted average fully diluted basis, multiplied by seven                     The note holder has the right to convert all or any part of the outstanding principal amount of this note, together with interest, if any, into shares of the Company’s common stock, at any time on or after March 30, 2010 (or such earlier date if the audited consolidated financial statements of the Company for the fiscal year ending December 31, 2009 are available on a date prior to March 30, 2010) and prior to the maturity date (or such later date on which this note is paid in full), at a conversion price per share of common stock equal to US $0.80.   On April 29, 2009, CREG and the Investors amended and restated the 5% secured convertible promissory note (the “Second Note”), which was issued as part of the amendment of the Purchase Agreement on April 28, 2008. Accordingly, the Conversion Rights and Conversion Price were amended so that the holder of the Second Note has the right, but not the obligation, to convert all or any part of the outstanding principal amount of the Second Note, together with interest, into shares of the Company’s common stock, at any time on or after March 30, 2010 (or such earlier date if the audited consolidated financial statements of the Company for the fiscal year ending December 31, 2009 are available on a date prior to March 30, 2010) and prior to the maturity date (or such later date on which this Note is paid in full), at the following conversion price: (a) an amount equal to (i) the Company’s net profit, adjusted in accordance with the Second Note, multiplied by (ii) 5.5, and less (iii) the principal amount of the Second Note, together with accrued interest, divided by (b) the then total shares of the Company’s common stock outstanding on a fully-diluted basis.                                                        
Conversion price       $ 2.46               $ 2.46 $ 2.46         $ 0.80 $ 1.154 $ 1.154                                                        
Beneficial conversion feature connection with convertible note                                     4,334,192 3,150,000                                                        
Agreement date                                                                                     Apr. 28, 2012          
Convertible notes               5,813,762   5,813,762   4,626,645                                                             3,000,000          
Maturity date extended                                                                                     60 days          
Principal amount date                                                                                   Aug. 26, 2012            
Principal amount                                                                                   3,000,000            
Interest Payment                                                                                   240,000            
Note Principal Amount                                                                                       2,000,000        
Number tranches                                                                                         2      
Promissory note to be issued under repurchase agreement                                           50,000,000                                   100,000,000 100,000,000         50,000,000 50,000,000  
Fund to be raised                                                                                               100,000,000
Interest rate term           Each Note bears interest at a rate equal to that of PBOC base interest rate for the relevant interest period (the period commencing on and including January 1 of each year and ending on and including December 31 of such year) plus 2%. If Cinda does not convert or fully convert the Notes to shares prior to maturity, the Company will pay the difference between the interest rate described above and 18% on the outstanding amount.                                                                                    
Collateral On December 9, 2011, Mr. Ku executed a Certificate for additional collateral to pledge an additional 1.5 million shares of the common stock of the Company that he owns as collateral to Cinda to secure the unpaid note         As collateral for the notes, Mr. Ku, CEO of the Company entered into a Share Pledge Agreement with Cinda on August 18, 2010, to pledge each 4,500,000 shares of the Company's common stock held by him to secure the first Note and the second note before its issuance, respectively.                                                                                    
Common Stock                                                                     1,500,000 4,500,000 4,500,000                      
Proceeds from loans   7,533,391 50,000,000 7,533,391 50,000,000         4,756,318 4,127,746                                                                          
Strike price                           2.46 2.46                                                                  
Beneficial conversion feature amortized                       10,747,493                                                                        
Debt redemption description The Company and Cinda also agreed that the Company will redeem the outstanding convertible note at the U.S. Dollar amount equivalent to RMB 25 million each on December 30, 2011 and November 30, 2012, respectively, plus accrued interest at 18% (the "Redemption Interest Rate") up to the applicable Redemption Date, minus any interest already accrued and paid (together with the Redemption Principal Amount, the "Redemption Price"). There was additional 5% interest rate on any default in payment of the Redemption Price and due on demand. The interest on the Redemption Principal Amount due on November 30, 2012 (the "Second Redemption Principal Amount") will accrue at 18% and should be payable by the Company on June 20, 2012 (was paid) and November 30, 2012, respectively                                                                                              
Debt to be redeemed                               25,000,000 25,000,000                           25,000,000   25,000,000                              
Debt redemption date                               2011-12-30 2012-11-30                             2011-12-31   2012-11-30                            
Redemption interest rate 18.00%                                                                                              
Additional interest charge 5.00%                                                                                              
Repayment of loans                                             3,970,000 25,000,000 7,940,000 50,000,000                                            
Payment Interest                   1,887,443 1,163,756                       1,130,000 7,140,000 1,000,000 6,450,000                                            
Amortization of beneficial conversion feature                                                     583,650 1,167,300                                        
Interest rate upon redemption                                                     18.00%                                          
Interest expense               $ 2,514,313 $ 3,085,498 $ 5,115,547 $ 5,611,459                               $ 178,362 $ 382,487