Consolidated and Combined Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended		3 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Apr. 19, 2011 STAG Predecessor Group
Revenue
Rental income	$ 35,749	$ 116,344	$ 73,977	$ 6,489
Tenant recoveries	4,453	16,349	8,763	1,218
Other income	914	1,200	1,312
Total revenue	41,116	133,893	84,052	7,707
Expenses
Property	3,583	10,634	5,983	1,194
General and administrative	8,365	17,840	14,549	322
Real estate taxes and insurance	3,597	13,376	6,858	873
Asset management fees				162
Property acquisition costs	1,088	3,427	4,218
Depreciation and amortization	21,325	67,556	42,427	2,345
Loss on impairment			622
Other expenses	294	621	339
Total expenses	38,252	113,454	74,996	4,896
Other income (expense)
Interest income	28	13	19	1
Interest expense	(11,829)	(20,319)	(16,110)	(3,825)
Gain on interest rate swaps	2,179		215	762
Formation transaction costs	(3,674)
Offering costs	(78)	(27)	(68)
Loss on extinguishment of debt			(929)
Total other income (expense)	(13,374)	(20,333)	(16,873)	(3,062)
Net income (loss) from continuing operations	(10,510)	106	(7,817)	(251)
Discontinued operations
Income (loss) attributable to discontinued operations	954	(509)	1,337	22
Loss on impairment attributable to discontinued operations			(3,941)
Gain on sales of real estate	329	5,305	222
Total income (loss) attributable to discontinued operations	1,283	4,796	(2,382)	22
Net income (loss)	(9,227)	4,902	(10,199)	(229)
Less: loss attributable to noncontrolling interest after preferred stock dividends	(3,396)	(620)	(3,720)
Net income (loss) attributable to STAG Industrial, Inc.	(5,831)	5,522	(6,479)
Less: preferred stock dividends	1,018	9,495	6,210
Less: amount allocated to unvested restricted stockholders		262	122
Net loss attributable to common stockholders	$ (6,849)	$ (4,235)	$ (12,811)
Weighted average common shares outstanding - basic and diluted (in shares)	15,630,910	42,364,125	25,046,664
Loss per share - basic and diluted
Loss from continuing operations attributable to common stockholders (in dollars per share)	$ (0.49)	$ (0.20)	$ (0.44)
Income (loss) from discontinued operations attributable to common stockholders (in dollars per share)	$ 0.05	$ 0.10	$ (0.07)
Loss per share - basic and diluted (in dollars per share)	$ (0.44)	$ (0.10)	$ (0.51)