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Investment in Unconsolidated Entities (Details Textual)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jan. 31, 2014
USD ($)
Dec. 31, 2014
January 1, 2014 through August 18, 2014 [Member]
USD ($)
Dec. 31, 2014
August 19, 2014 through December 31, 2014 [Member]
USD ($)
Dec. 31, 2014
Guarantee Obligations [Member]
USD ($)
Dec. 31, 2014
Investment Type [Member]
USD ($)
Jan. 31, 2014
Maximum [Member]
Jan. 31, 2014
Minimum [Member]
Dec. 31, 2014
Copper Beech Purchase Agreement [Member]
Dec. 31, 2014
Copper Beech [Member]
January 1, 2014 through August 18, 2014 [Member]
Dec. 31, 2014
Copper Beech [Member]
August 19, 2014 through December 31, 2014 [Member]
Dec. 31, 2014
Canadian Dealer Offered Rate [Member]
Dec. 31, 2014
Canadian Dealer Offered Rate [Member]
Maximum [Member]
Dec. 31, 2014
The Grove at Greensboro [Member]
USD ($)
Dec. 31, 2014
The Grove at Louisville [Member]
USD ($)
Dec. 31, 2014
Kentucky [Member]
USD ($)
Dec. 31, 2014
Preferred Class B [Member]
Dec. 31, 2014
Preferred Class A [Member]
USD ($)
Dec. 31, 2014
Preferred Class A [Member]
CAD
Dec. 31, 2014
HIM Holdings LP [Member]
USD ($)
Dec. 31, 2014
HIM Holdings LP [Member]
CAD
Jan. 31, 2014
HIM Holdings LP [Member]
Maximum [Member]
Jan. 31, 2014
HIM Holdings LP [Member]
Minimum [Member]
Dec. 31, 2014
CSH Montreal [Member]
Jan. 31, 2014
CSH Montreal [Member]
CAD
Dec. 31, 2014
CSH Montreal [Member]
Maximum [Member]
Dec. 31, 2014
CSH Montreal [Member]
Minimum [Member]
Dec. 31, 2014
Cb Portfolio [Member]
USD ($)
Aug. 18, 2014
Cb Portfolio [Member]
USD ($)
Dec. 31, 2013
Cb Portfolio [Member]
Dec. 31, 2013
Cb Portfolio [Member]
Maximum [Member]
Dec. 31, 2013
Cb Portfolio [Member]
Minimum [Member]
Dec. 31, 2014
Cb Portfolio [Member]
Copper Beech [Member]
Dec. 31, 2013
Cb Portfolio [Member]
Copper Beech [Member]
Jan. 31, 2014
Hsre Campus Crest Llc [Member]
Maximum [Member]
Jan. 31, 2014
Hsre Campus Crest Llc [Member]
Minimum [Member]
Jan. 31, 2014
Beaumont and Partners [Member]
Schedule of Equity Method Investments [Line Items]                                                                            
Equity method investment, ownership percentage       67.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ ccg_PeriodAxis
= ccg_JanuaryOneTwoZeroOneFourThroughAugustEighteenTwoZeroOneFourMember		 48.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ ccg_PeriodAxis
= ccg_AugustNinteenTwoZeroOneFourThroughDecemberThirtyoneTwoZeroOneFourMember		     47.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 48.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= ccg_CopperBeechPurchaseAgreementMember		                         47.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= ccg_HimHoldingsLpMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= ccg_HimHoldingsLpMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 60.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= ccg_CshMontrealMember		       48.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		 [1] 48.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		   48.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		 25.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		     63.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ccg_HsreCampusCrestLlcMember		 49.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ccg_HsreCampusCrestLlcMember		 53.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ccg_BeaumontAndPartnersMember
Payments to Acquire Assets, Investing Activities $ 4,700,000us-gaap_PaymentsToAcquireAssetsInvestingActivities                                       $ 56,200,000us-gaap_PaymentsToAcquireAssetsInvestingActivities
/ dei_LegalEntityAxis
= ccg_HimHoldingsLpMember		 65,000,000us-gaap_PaymentsToAcquireAssetsInvestingActivities
/ dei_LegalEntityAxis
= ccg_HimHoldingsLpMember		                                
Interest from Joint Venture Properties       28ccg_InterestFromJointVentureProperties
/ ccg_PeriodAxis
= ccg_JanuaryOneTwoZeroOneFourThroughAugustEighteenTwoZeroOneFourMember		 36ccg_InterestFromJointVentureProperties
/ ccg_PeriodAxis
= ccg_AugustNinteenTwoZeroOneFourThroughDecemberThirtyoneTwoZeroOneFourMember		                                                                  
Return On Investment Of Properties                                   9.00%ccg_ReturnOnInvestmentOfProperties
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassBMember		             39.50%ccg_ReturnOnInvestmentOfProperties
/ dei_LegalEntityAxis
= ccg_CshMontrealMember		         45.00%ccg_ReturnOnInvestmentOfProperties
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		                
Number of joint venture properties                     28ccg_NumberOfJointVentureProperties
/ us-gaap_BusinessAcquisitionAxis
= ccg_CopperBeechMember
/ ccg_PeriodAxis
= ccg_JanuaryOneTwoZeroOneFourThroughAugustEighteenTwoZeroOneFourMember		 35ccg_NumberOfJointVentureProperties
/ us-gaap_BusinessAcquisitionAxis
= ccg_CopperBeechMember
/ ccg_PeriodAxis
= ccg_AugustNinteenTwoZeroOneFourThroughDecemberThirtyoneTwoZeroOneFourMember		                                     36ccg_NumberOfJointVentureProperties
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		     35ccg_NumberOfJointVentureProperties
/ us-gaap_BusinessAcquisitionAxis
= ccg_CopperBeechMember
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		 28ccg_NumberOfJointVentureProperties
/ us-gaap_BusinessAcquisitionAxis
= ccg_CopperBeechMember
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		      
Preferred Stock, Value, Issued 61,000us-gaap_PreferredStockValue 61,000us-gaap_PreferredStockValue 13,800,000us-gaap_PreferredStockValue                       2,700,000us-gaap_PreferredStockValue
/ ccg_ConstructionLoansAxis
= ccg_GroveAtGreensboroMember		 2,700,000us-gaap_PreferredStockValue
/ ccg_ConstructionLoansAxis
= ccg_GroveAtLouisvilleMember		 1,900,000us-gaap_PreferredStockValue
/ us-gaap_StatementGeographicalAxis
= ccg_KentuckyMember		   13,800,000us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember		 16,000,000us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember		           16,000,000us-gaap_PreferredStockValue
/ dei_LegalEntityAxis
= ccg_CshMontrealMember		                        
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum                         3.00%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
/ ccg_PurchaseAndSaleAgreementAxis
= ccg_CanadianDealerOfferedRateMember		                                                  
Debt Instrument, Basis Spread on Variable Rate 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1                         3.39%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ ccg_PurchaseAndSaleAgreementAxis
= ccg_CanadianDealerOfferedRateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                         3.39%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= ccg_CshMontrealMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= ccg_CshMontrealMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                    
Impairment Of Unconsolidated Entities 57,800,000ccg_ImpairmentOfUnconsolidatedEntities                                                                          
Commitment Fee Percentage Each Quarter                                     1.00%ccg_CommitmentFeePercentageEachQuarter
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember		 1.00%ccg_CommitmentFeePercentageEachQuarter
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember		                                    
Percentage Of Return On Investment                                     10.00%ccg_PercentageOfReturnOnInvestment
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember		 10.00%ccg_PercentageOfReturnOnInvestment
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember		                                    
Fair Value, Option, Events Triggering Election, Effect on Earnings                                                           33,400,000us-gaap_FairValueOptionEventsTriggeringElectionEffectOnEarnings
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		                
Other Liabilities 22,092,000us-gaap_OtherLiabilities 11,167,000us-gaap_OtherLiabilities       4,500,000us-gaap_OtherLiabilities
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_GuaranteeObligationsMember		 53,300,000us-gaap_OtherLiabilities
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InvestmentTypeMember		                                                              
Debt Instrument, Maturity Date                         Jan. 13, 2016                                                  
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 24,600,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 16,400,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations                                                                        
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (4,400,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 24,200,000us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations                                                                        
Net Cash Provided by (Used in) Financing Activities, Continuing Operations (17,700,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 9,100,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations                                                                        
Cash Distributions Available                                                         13,000,000ccg_CashDistributionsAvailable
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		                  
Cash For Other Distributions                                                         $ 1,000,000ccg_CashForOtherDistributions
/ us-gaap_StatementScenarioAxis
= ccg_CbPortfolioMember		                  
[1] As of December 31, 2014, the Company had a 48.0% ownership interest in the CB Portfolio.