Consolidated and Combined Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Apr. 19, 2011 STAG Predecessor Group	Dec. 31, 2010 STAG Predecessor Group
Revenue
Rental income	$ 36,730	$ 75,390	$ 6,489	$ 22,234
Tenant recoveries	4,468	8,785	1,218	3,685
Other income	914	1,312
Total revenue	42,112	85,487	7,707	25,919
Expenses
Property	3,584	5,998	1,194	3,407
General and administrative	8,365	14,549	322	330
Real estate taxes and insurance	3,620	6,890	873	2,715
Asset management fees			162	544
Property acquisition costs	1,088	4,218
Depreciation and amortization	21,958	43,275	2,345	8,931
Loss on impairments		622
Other expenses	294	339
Total expenses	38,909	75,891	4,896	15,927
Other income (expense)
Interest income	28	19	1	16
Interest expense	(11,841)	(16,110)	(3,825)	(12,817)
Gain (loss) on interest rate swaps	2,179	215	762	(282)
Formation transaction costs	(3,674)
Offering costs	(78)	(68)
Loss on extinguishment of debt		(929)
Total other income (expense)	(13,386)	(16,873)	(3,062)	(13,083)
Net loss from continuing operations	(10,183)	(7,277)	(251)	(3,091)
Discontinued operations
Income attributable to discontinued operations	627	797	22	145
Loss on impairment attributable to discontinued operations		(3,941)
Gain on sale of real estate	329	222
Total income (loss) attributable to discontinued operations	956	(2,922)	22	145
Net loss	(9,227)	(10,199)	(229)	(2,946)
Less: loss attributable to noncontrolling interest	(3,396)	(3,720)
Net loss attributable to STAG Industrial, Inc.	(5,831)	(6,479)
Less: preferred stock dividends	1,018	6,210
Less: amount allocated to unvested restricted stockholders		122
Net loss attributable to common stockholders	$ (6,849)	$ (12,811)
Weighted average common shares outstanding - basic and diluted (in shares)	15,630,910	25,046,664
Income (loss) per share - basic and diluted
Income (loss) from continuing operations attributable to common stockholders (in dollars per share)	$ (0.48)	$ (0.42)
Income (loss) from discontinued operations attributable to common stockholders (in dollars per share)	$ 0.04	$ (0.09)
Income (loss) per share - basic and diluted (in dollars per share)	$ (0.44)	$ (0.51)