Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
Income Taxes (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
GAAP basis financial statement net income (loss)	$ 1,222,407us-gaap_NetIncomeLoss	$ 1,452,045us-gaap_NetIncomeLoss	$ 1,697,210us-gaap_NetIncomeLoss	$ 1,679,819us-gaap_NetIncomeLoss	$ 168,987us-gaap_NetIncomeLoss	$ 244,677us-gaap_NetIncomeLoss	$ (566,570)us-gaap_NetIncomeLoss	$ (840,226)us-gaap_NetIncomeLoss	$ 6,051,481us-gaap_NetIncomeLoss	$ (993,132)us-gaap_NetIncomeLoss	$ (8,484,523)us-gaap_NetIncomeLoss
Decrease (increase) in net income (loss) resulting from:
Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes									3,939,067	4,201,387	1,169,740
Rental income accrued for income tax purposes (less than) greater than amounts for financial reporting purposes									(969,159)	(5,399,197)	(1,001,255)
Amortization of intangible lease assets incurred for financial reporting purposes in excess of amounts for income tax purposes									15,309,760	12,948,803	7,862,273
Bad debt expense for financial reporting purposes in excess of amounts for income tax purposes									94,918	40,846	0
Expenses with respect to The Point at Clark Street REIT, LLC for financial reporting purposes (less than) in excess of amounts for income tax purposes									0	(268,864)	1,248,094
Acquisition expenses for financial reporting purposes in excess of amounts for income tax purposes									0	1,674,094	5,705,784
Other expenses for financial reporting purposes in excess of amounts for income tax purposes									150,452	51,469	65,460
Income tax basis net income, prior to dividends-paid deduction									24,576,519	12,255,406	6,565,573
Tax basis carrying value of total assets	671,700,000us-gaap_RealEstateFederalIncomeTaxBasis								671,700,000us-gaap_RealEstateFederalIncomeTaxBasis
Ordinary income									80.00%	41.00%	32.00%
Capital gains									0.00%	0.00%	0.00%
Return of capital									20.00%	59.00%	68.00%
Total									100.00%	100.00%	100.00%
Deferred tax assets	0us-gaap_DeferredTaxAssetsLiabilitiesNet				0us-gaap_DeferredTaxAssetsLiabilitiesNet				0us-gaap_DeferredTaxAssetsLiabilitiesNet	0us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred tax liabilities	$ 0us-gaap_DeferredTaxLiabilities				$ 0us-gaap_DeferredTaxLiabilities				$ 0us-gaap_DeferredTaxLiabilities	$ 0us-gaap_DeferredTaxLiabilities

SIGNATURE OFFICE REIT INC 10-K