XML 45 R32.htm IDEA: XBRL DOCUMENT v3.7.0.1

Real Estate and Intangible Assets - Summary of Total Revenue and Earnings (lLoss) Recognized from Business Combination (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Real Estate [Abstract]
Rental Revenue	$ 139	$ 139
Earnings (Loss)	$ (121)	$ (121)

X

- Definition

Net income loss from acquired properties.

+ References

No definition available.

+ Details

Name:	good_NetIncomeLossFromAcquiredProperties
Namespace Prefix:	good_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Operating leases income statement lease revenue from acquired properties.

+ References

No definition available.

+ Details

Name:	good_OperatingLeasesIncomeStatementLeaseRevenueFromAcquiredProperties
Namespace Prefix:	good_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RealEstateAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration