Consolidated and Combined Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Apr. 19, 2011	Sep. 30, 2011	Sep. 30, 2012
Revenue
Rental income	$ 19,261	$ 13,394		$ 23,018	$ 52,448
Tenant recoveries	2,135	1,438		2,511	6,283
Other income	331	321		588	982
Total revenue	21,727	15,153		26,117	59,713
Expenses
Property	1,345	1,315		2,110	4,439
General and administrative	3,656	2,453		4,513	9,962
Real estate taxes and insurance	1,677	1,284		2,184	4,816
Property acquisition costs	1,067	368		695	2,509
Depreciation and amortization	10,354	7,765		14,157	28,465
Loss on impairment	3,941				4,563
Other expenses	87				146
Total expenses	22,127	13,185		23,659	54,900
Other income (expense)
Interest income	9	6		15	17
Interest expense	(3,578)	(4,330)		(7,446)	(11,888)
Gain on interest rate swaps		770	800	1,270	215
Formation transaction costs		(61)		(3,789)
Offering costs		(78)		(78)	(68)
Loss on extinguishment of debt	(947)				(929)
Total other income (expense)	(4,516)	(3,693)		(10,028)	(12,653)
Net loss from continuing operations	(4,916)	(1,725)		(7,570)	(7,840)
Discontinued operations
Income (loss) attributable to discontinued operations		1,153		1,099	(184)
Gain on sale of real estate					219
Total income (loss) attributable to discontinued operations		1,153		1,099	35
Net loss	(4,916)	(572)		(6,471)	(7,805)
Less: loss attributable to noncontrolling interest	(1,248)	(188)		(2,155)	(3,244)
Net loss attributable to STAG Industrial, Inc.	(3,668)	(384)		(4,316)	(4,561)
Less: preferred stock dividends	1,553				4,659
Less: amount allocated to unvested restricted stockholders	41				81
Net loss attributable to common stockholders	(5,262)	(384)		(4,316)	(9,301)
Weighted average common shares outstanding - basic and diluted (in shares)	29,752,057	15,815,282		15,524,807	21,716,590
Income (loss) per share - basic and diluted
Loss from continuing operations attributable to common stockholders (in dollars per share)	$ (0.18)	$ (0.07)		$ (0.33)	$ (0.43)
Income from discontinued operations attributable to common stockholders (in dollars per share)		$ 0.05		$ 0.05	$ 0.00
Loss per share - basic and diluted (in dollars per share)	$ (0.18)	$ (0.02)		$ (0.28)	$ (0.43)
Dividends declared per common share (in dollars per share)	$ 0.27	$ 0.26		$ 0.4657	$ 0.80
STAG Predecessor Group
Revenue
Rental income			6,866
Tenant recoveries			1,218
Total revenue			8,084
Expenses
Property			1,193
General and administrative			322
Real estate taxes and insurance			879
Asset management fees			170
Depreciation and amortization			2,405
Total expenses			4,969
Other income (expense)
Interest income			1
Interest expense			(3,954)
Gain on interest rate swaps			762
Total other income (expense)			(3,191)
Net loss from continuing operations			(76)
Discontinued operations
Income (loss) attributable to discontinued operations			(153)
Total income (loss) attributable to discontinued operations			(153)
Net loss			$ (229)