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Statutory Reserves - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2012
Statutory Surplus Reserve Fund |
Subsidiary or Equity Method Investee [Line Items] |
Percentage of net income to be transfer to a statutory surplus reserve | 10.00%
Statutory Surplus Reserve Fund | Minimum |
Subsidiary or Equity Method Investee [Line Items] |
Minimum surplus reserve percentage to registered capital to be maintained to utilize for business expansion or to convert into share capital | 25.00%
Statutory Surplus Reserve Fund | Maximum |
Subsidiary or Equity Method Investee [Line Items] |
Surplus reserve percentage to registered capital | 50.00%
Common Welfare Fund | Minimum |
Subsidiary or Equity Method Investee [Line Items] |
Percentage of net income that can be elected to be transferred to common welfare fund | 5.00%
Common Welfare Fund | Maximum |
Subsidiary or Equity Method Investee [Line Items] |
Percentage of net income that can be elected to be transferred to common welfare fund | 10.00%

X
- Definition Percentage of Consolidated Net Income + References No definition available. + Details
Name: | creg_PercentageOfConsolidatedNetIncome
Namespace Prefix: | creg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Income Transferred To Retained Earnings Appropriated For Legal Reserve + References No definition available. + Details
Name: | creg_PercentageOfIncomeTransferredToRetainedEarningsAppropriatedForLegalReserve
Namespace Prefix: | creg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Total Remaining Reserve + References No definition available. + Details
Name: | creg_PercentageOfTotalRemainingReserve
Namespace Prefix: | creg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Statutory Surplus Reserve Fund Percentage + References No definition available. + Details
Name: | creg_StatutorySurplusReserveFundPercentage
Namespace Prefix: | creg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration