|
Organization and Significant Accounting Policies (Details Textual) (USD $)
|
3 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Dec. 31, 2010
|
Feb. 29, 2012
Series C Preferred Stock [Member]
|
Jun. 30, 2012
Series C Preferred Stock [Member]
|
Jun. 30, 2012
Real Estate [Member]
|
Jun. 30, 2011
Real Estate [Member]
|
Jun. 30, 2012
Real Estate [Member]
|
Jun. 30, 2011
Real Estate [Member]
|
Jun. 30, 2012
GCLP Business Trust I [Member]
Rate
|
Jun. 30, 2012
GCLP Business Trust II [Member]
Rate
|
Jun. 30, 2012
Gladstone Commercial Advisers, Inc. [Member]
Rate
|
Jun. 30, 2012
Building and Building Improvements [Member]
|
Jun. 30, 2012
Maximum [Member]
|
Jun. 30, 2011
Maximum [Member]
|
Jun. 30, 2012
Maximum [Member]
|
Jun. 30, 2011
Maximum [Member]
|
Jun. 30, 2012
Maximum [Member]
Equipment and fixtures [Member]
|
Jun. 30, 2012
Minimum [Member]
|
Jun. 30, 2011
Minimum [Member]
|
Jun. 30, 2012
Minimum [Member]
|
Jun. 30, 2011
Minimum [Member]
|
Jun. 30, 2012
Minimum [Member]
Equipment and fixtures [Member]
|
|
| 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 | ||||||||||||||||||||||||
| Expected lease up period for estimating carrying costs | 18 months | 9 months | |||||||||||||||||||||||
| Estimated useful life | 39 years | 7 years | 5 years | ||||||||||||||||||||||
| Real estate depreciation expense | 2,900,000 | 2,500,000 | 5,600,000 | 4,900,000 | |||||||||||||||||||||
| Amortization related to above-market lease | 100,000 | 100,000 | 200,000 | 200,000 | |||||||||||||||||||||
| Amortization related to below-market lease | 200,000 | 300,000 | 500,000 | 500,000 | |||||||||||||||||||||
| Remaining term of in-place leases and unamortized lease | 15 years | 10 years | |||||||||||||||||||||||
| Series C preferred stock | 7.125% | 7.125% | |||||||||||||||||||||||
| Total amortization expense related to intangible assets | 1,100,000 | 1,000,000 | 2,200,000 | 1,900,000 | |||||||||||||||||||||
| Payments of deferred financing costs | 600,000 | 200,000 | 3,018,000 | 226,000 | |||||||||||||||||||||
| Total amortization expense related to deferred financing costs is included in interest expense | $ 400,000 | $ 200,000 | $ 703,000 | $ 456,000 | |||||||||||||||||||||