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Real Estate and Intangible Assets - Lease Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Abstract]
Fixed lease payments	$ 121,303	$ 117,248	$ 110,273
Variable lease payments	16,385	15,904	4,114
Lease payments	137,688	133,152	$ 114,387
Accounts receivable from tenants	$ 1,400	$ 1,700

X

- Definition

Accounts Receivable From Tenants

+ References

No definition available.

+ Details

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Namespace Prefix:	good_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

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- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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-Publisher FASB
-Name Accounting Standards Codification
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