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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Adjustment to Additional Paid in Capital resulting from the recognition of deferred taxes for the temporary difference of the convertible debt with a beneficial conversion feature. A beneficial conversion feature is a nondetachable conversion feature that is in-the-money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Beneficial Conversion Feature -URI http://asc.fasb.org/extlink&oid=6505963 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 05-8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=21917533&loc=d3e34017-109320 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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