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Consolidated Statements of Cash Flows (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
Statement of Cash Flows [Abstract]
Allowance for tenant improvement capitalized	$ 520

X

- Definition

Allowance for tenant improvements capitalized.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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