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Equity (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 25, 2013
Dec. 31, 2014
Class of Stock [Line Items]      
Common stock subject to redemption $ 291,255us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests   $ 50,666us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
Summary of Redemption Price Per Share [Abstract]      
Redemption price per share within 1 year, percent 0.00%gcearii_RedemptionPricePerShareWithinOneYearPercent    
Redemption price per share year 1, percent 90.00%gcearii_RedemptionPricePerShareYearOnePercent    
Redemption price per share year 2, percent 95.00%gcearii_RedemptionPricePerShareYearTwoPercent    
Redemption price per share year 3, percent 97.50%gcearii_RedemptionPricePerShareYearThreePercent    
Redemption price per share year 4 and greater, percent 100.00%gcearii_RedemptionPricePerShareYearFourandGreaterPercent    
Share Redemption Program      
Class of Stock [Line Items]      
Minimum Holding Period for Redemption of Stock 1 year    
Minimum Redemption Percentage 25.00%gcearii_MinimumRedemptionPercentage
/ us-gaap_ShareRepurchaseProgramAxis
= gcearii_ShareRedemptionProgramMember
   
Maximum redemption percentage of weighted average shares outstanding 5.00%gcearii_RedemptionPercentageWeightedAverageSharesOutstanding
/ us-gaap_ShareRepurchaseProgramAxis
= gcearii_ShareRedemptionProgramMember
   
Distribution Reinvestment Plan      
Class of Stock [Line Items]      
Prior Notice Period for Terminate Plan   10 days  
Distribution Reinvestment Plan | Class A      
Class of Stock [Line Items]      
Common stock, number of shares issued (in shares) 30,658us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= gcearii_DistributionReinvestmentPlanMember
  5,333us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= gcearii_DistributionReinvestmentPlanMember