Gladstone Commercial Corporation Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Organization, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)

Organization, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015 Subsidiary	Mar. 31, 2014
Organization And Significant Accounting Policies [Line Items]
Number of subsidiaries interest owned in general and limited partnership	2
Non-qualifying income related to real estate portfolio	$ 0
Amortization related to below-market lease	200,000us-gaap_AmortizationOfBelowMarketLease	200,000us-gaap_AmortizationOfBelowMarketLease
Total amortization expense related to intangible assets	3,000,000us-gaap_AmortizationOfIntangibleAssets	2,300,000us-gaap_AmortizationOfIntangibleAssets
Agreement termination date	Aug. 31, 2015
Payments of deferred financing costs	216,000us-gaap_PaymentsOfFinancingCosts	360,000us-gaap_PaymentsOfFinancingCosts
Total amortization expense related to deferred financing costs is included in interest expense	431,000us-gaap_AmortizationOfFinancingCosts	386,000us-gaap_AmortizationOfFinancingCosts
Liabilities accrued	20,000	0
Expenses recorded to general and administrative expense	40,000	30,000
Aggregate undiscounted obligation on properties	9,400,000
Expected payment to be made in next twelve months	0
Expected payment to be made in second year	0us-gaap_OtherCommitmentDueInSecondYear
Expected payment to be made in third year	0us-gaap_OtherCommitmentDueInThirdYear
Expected payment to be made in fourth year	0us-gaap_OtherCommitmentDueInFourthYear
Expected payment to be made in fifth year	0us-gaap_OtherCommitmentDueInFifthYear
Real Estate [Member]
Organization And Significant Accounting Policies [Line Items]
Real estate depreciation expense	5,200,000	4,400,000
Minimum [Member]
Organization And Significant Accounting Policies [Line Items]
Expected lease up period for estimating carrying costs	9 months
Remaining term of in-place leases and unamortized lease	10 years
Percentage of discount rate for calculating undiscounted obligation	2.50%
Maximum [Member]
Organization And Significant Accounting Policies [Line Items]
Expected lease up period for estimating carrying costs	18 months
Remaining term of in-place leases and unamortized lease	15 years
Percentage of discount rate for calculating undiscounted obligation	7.60%
Above Market Leases [Member]
Organization And Significant Accounting Policies [Line Items]
Amortization related to above-market lease	$ 100,000	$ 100,000
Ohio [Member]
Organization And Significant Accounting Policies [Line Items]
Agreement termination date	Jun. 30, 2015
Buildings and Improvements [Member]
Organization And Significant Accounting Policies [Line Items]
Estimated useful life	39 years
Equipment and Fixtures [Member] \| Minimum [Member]
Organization And Significant Accounting Policies [Line Items]
Estimated useful life	5 years
Equipment and Fixtures [Member] \| Maximum [Member]
Organization And Significant Accounting Policies [Line Items]
Estimated useful life	20 years
Gladstone Commercial Advisers, Inc. [Member]
Organization And Significant Accounting Policies [Line Items]
Company ownership percentage of voting securities of Commercial Advisers	100.00%
GCLP Business Trust I [Member]
Organization And Significant Accounting Policies [Line Items]
Percentage of limited partnership interest transferred to business unit	99.00%
Number of trust shares exchanged for limited partnership interest	100
Subsidiary and business trust of the Company, formed under the laws of the Commonwealth of Massachusetts, date	Dec. 28, 2005
GCLP Business Trust II [Member]
Organization And Significant Accounting Policies [Line Items]
Percentage of limited partnership interest transferred to business unit	1.00%
Number of trust shares exchanged for general partnership interest	100
Subsidiary and business trust of the Company, formed under the laws of the Commonwealth of Massachusetts, date	Dec. 28, 2005