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Organization - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended	42 Months Ended	137 Months Ended
		Mar. 01, 2021 USD ($)	Mar. 31, 2021 USD ($) realEstateProperty $ / shares shares	Mar. 31, 2021 USD ($) realEstateProperty $ / shares shares	Mar. 31, 2021 USD ($) realEstateProperty $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares			$ 0.001	$ 0.001	$ 0.001	$ 0.001
Proceeds from sale of shares | $				$ 2,800,000
Number of shares outstanding (in shares)			323,881,102	323,881,102	323,881,102	230,320,668
Shares issued | $	[1]		$ 324	$ 324	$ 324	$ 230
Units eligible towards redemption (in shares)			556,099	556,099	556,099	556,099
GCEAR Operating Partnership
Subsidiary, Sale of Stock [Line Items]
Limited liability partnership percentage of interest held (percent)			91.00%
CCIT II Merger
Subsidiary, Sale of Stock [Line Items]
Total consideration | $		$ 1,300,000
Number of shares to be received for each share converted		1.392
Sponsor and Affiliates
Subsidiary, Sale of Stock [Line Items]
Number of properties contributed | realEstateProperty			5	5	5
Sponsor and Affiliates | GCEAR Operating Partnership
Subsidiary, Sale of Stock [Line Items]
Limited liability partnership percentage of interest held (percent)			7.80%
Third Parties | GCEAR Operating Partnership
Subsidiary, Sale of Stock [Line Items]
Limited liability partnership percentage of interest held (percent)			1.20%
Board Chairman
Subsidiary, Sale of Stock [Line Items]
Partnership units owned (in shares)			2,400,000	2,400,000	2,400,000
Private Offerings, Public Offerings, Dividend Reinvestment Plan ("DRP") Offerings and Mergers
Subsidiary, Sale of Stock [Line Items]
Implied EA-1 common stock issued in consideration			285,399,745	285,399,745	285,399,745
Proceeds from sale of shares | $					$ 2,800,000
Distribution Reinvestment Plan
Subsidiary, Sale of Stock [Line Items]
Shares issued | $			$ 325,400	$ 325,400	$ 325,400	$ 318,200
Units eligible towards redemption (in shares)			30,407	30,407	30,407
Common Class A
Subsidiary, Sale of Stock [Line Items]
Number of shares outstanding (in shares)			24,415,356	24,415,356	24,415,356
Common Class T
Subsidiary, Sale of Stock [Line Items]
Number of shares outstanding (in shares)			560,462	560,462	560,462
Common Class E
Subsidiary, Sale of Stock [Line Items]
Number of shares outstanding (in shares)			248,606,760	248,606,760	248,606,760
[1] See Note 9, Equity, for the number of shares outstanding of each class of common stock as of March 31, 2021.

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