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Organization and Significant Accounting Policies (Details) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
Property
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Sep. 30, 2011
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Sep. 30, 2012
Property
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Sep. 30, 2011
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Dec. 31, 2010
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Feb. 29, 2012
Series C Preferred Stock [Member]
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Sep. 30, 2012
Series C Preferred Stock [Member]
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Sep. 30, 2012
Real Estate [Member]
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Sep. 30, 2011
Real Estate [Member]
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Sep. 30, 2012
Real Estate [Member]
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Sep. 30, 2011
Real Estate [Member]
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Sep. 30, 2012
GCLP Business Trust I [Member]
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Sep. 30, 2012
GCLP Business Trust II [Member]
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Sep. 30, 2012
Gladstone Commercial Advisers, Inc. [Member]
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Sep. 30, 2012
Building and building improvements [Member]
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Sep. 30, 2012
Maximum [Member]
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Sep. 30, 2011
Maximum [Member]
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Sep. 30, 2012
Maximum [Member]
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Sep. 30, 2011
Maximum [Member]
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Sep. 30, 2012
Maximum [Member]
Equipment and fixtures [Member]
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Sep. 30, 2012
Minimum [Member]
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Sep. 30, 2011
Minimum [Member]
|
Sep. 30, 2012
Minimum [Member]
|
Sep. 30, 2011
Minimum [Member]
|
Sep. 30, 2012
Minimum [Member]
Equipment and fixtures [Member]
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| Organization and Significant Accounting Policies (Textual) [Abstract] | ||||||||||||||||||||||||||||
| Company ownership percentage of voting securities of Commercial Advisers | 100.00% | |||||||||||||||||||||||||||
| Percentage of limited partnership interest transferred to business unit | 99.00% | 1.00% | ||||||||||||||||||||||||||
| Number of trust shares exchanged for limited partnership interest | 100 | |||||||||||||||||||||||||||
| Number of trust shares exchanged for general partnership interest | 100 | |||||||||||||||||||||||||||
| Net income understated due to due diligence depreciation and amortization expense adjustments | $ 300,000 | |||||||||||||||||||||||||||
| Net income per share understated due to due diligence depreciation and amortization expense adjustments | $ 0.03 | |||||||||||||||||||||||||||
| Estimated useful life | 39 years | 7 years | 5 years | |||||||||||||||||||||||||
| Expected lease up period for estimating carrying costs | 18 months | 9 months | ||||||||||||||||||||||||||
| Real estate depreciation expense | 3,000,000 | 2,600,000 | [1] | 8,700,000 | 7,500,000 | |||||||||||||||||||||||
| Amortization related to above-market lease | 100,000 | 100,000 | 300,000 | 200,000 | ||||||||||||||||||||||||
| Amortization related to below-market lease | 300,000 | 300,000 | 800,000 | 800,000 | ||||||||||||||||||||||||
| Remaining term of in-place leases and unamortized lease | 15 years | 10 years | ||||||||||||||||||||||||||
| Series C preferred stock | 7.125% | 7.125% | ||||||||||||||||||||||||||
| Percentage of discount rate for calculating undiscounted obligation | 7.60% | 2.50% | ||||||||||||||||||||||||||
| Organization and Significant Accounting Policies (Additional Textual) [Abstract] | ||||||||||||||||||||||||||||
| Total amortization expense related to intangible assets | 1,200,000 | 1,000,000 | 3,500,000 | 3,000,000 | ||||||||||||||||||||||||
| Payments of deferred financing costs | 500,000 | 300,000 | 3,483,000 | 478,000 | ||||||||||||||||||||||||
| Total amortization expense related to deferred financing costs is included in interest expense | 400,000 | 200,000 | 1,103,000 | 684,000 | ||||||||||||||||||||||||
| Liabilities accrued | 300,000 | 0 | ||||||||||||||||||||||||||
| Recorded expenses | 43,000 | 39,000 | 124,000 | 116,000 | ||||||||||||||||||||||||
| Aggregate undiscounted obligation on properties | 9,200,000 | 9,200,000 | ||||||||||||||||||||||||||
| Number of properties impaired | 0 | 0 | ||||||||||||||||||||||||||
| Expected payment to be made in next twelve months | 0 | 0 | ||||||||||||||||||||||||||
| Expected payment to be made in second year | 0 | 0 | ||||||||||||||||||||||||||
| Expected payment to be made in third year | 0 | 0 | ||||||||||||||||||||||||||
| Expected payment to be made in fourth year | 0 | 0 | ||||||||||||||||||||||||||
| Expected payment to be made in fifth year | $ 0 | $ 0 | ||||||||||||||||||||||||||
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