Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearEight
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year five from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearFive
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year four from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearFour
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year nine from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearNine
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year one from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearOne
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year seven from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearSeven
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year six from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearSix
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year three from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearThree
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage as a concentration risk for termination right exercisable in year two from the balance sheet date.

No definition available.

Name:	gov_ConcentrationRiskPercentageForTerminationRightExercisableInYearTwo
Namespace Prefix:	gov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the expected acquisition cost to the tenant of real estate property currently leased from the entity at the end of lease term.

No definition available.

Name:	gov_ExpectedAcquisitionCostToTenantOfRealEstatePropertyCurrentlyLeasedFromEntityAtEndOfLeaseTerm
Namespace Prefix:	gov_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the number of state governments that are tenants of the entity.

No definition available.

Name:	gov_NumberOfStateGovernments
Namespace Prefix:	gov_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910