Consolidated and Combined Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Total Stockholder's Equity	Preferred Stock	Common Stock	Additional Paid in Capital	Common Stock Dividends in excess of Earnings	Owner's Deficit	Noncontrolling Interest - Unit holders in Operating Partnership	STAG Predecessor Group	STAG Predecessor Group Total Stockholder's Equity	STAG Predecessor Group Owner's Deficit
Balance at Dec. 31, 2008									$ 6,560	$ 6,560	$ 6,560
Increase (Decrease) in Stockholders' Equity
Distributions									(2,521)	(2,521)	(2,521)
Net income (loss)									(5,560)	(5,560)	(5,560)
Balance at Dec. 31, 2009									(1,521)	(1,521)	(1,521)
Increase (Decrease) in Stockholders' Equity
Distributions									(3,869)	(3,869)	(3,869)
Net income (loss)									(2,946)	(2,946)	(2,946)
Balance at Dec. 31, 2010									(8,336)	(8,336)	(8,336)
Balance at Dec. 31, 2010									(8,336)
Increase (Decrease) in Stockholders' Equity
Contributions									4,420	4,420	4,420
Distributions									(9,900)	(9,900)	(9,900)
Net income (loss)									(229)	(229)	(229)
Balance at Apr. 19, 2011	(14,043)	(14,043)			2		(14,045)		(14,045)	(14,045)	(14,045)
Balance (in shares) at Apr. 19, 2011				110
Increase (Decrease) in Stockholders' Equity
Proceeds from sale of common stock	205,563	205,563		158	205,405
Proceeds from sale of common stock (in shares)				15,812,500
Redemption of initial capitalization of STAG Industrial, Inc.	(2)	(2)			(2)
Redemption of initial capitalization of STAG Industrial, Inc. (in shares)				(110)
Issuance of units for acquisition of properties	95,670							95,670
Exchange of owners' equity for units		14,045					14,045	(14,045)
Offering costs	(19,537)	(19,537)			(19,537)
Issuance of restricted stock				1	(1)
Issuance of restricted stock (in shares)				80,809
Issuance of common stock (in shares)				8,251
Issuance of series A preferred stock	69,000	69,000	69,000
Dividends	(18,208)	(12,554)	(1,018)			(11,536)		(5,654)
Stock-based compensation	693	342			342			351
Rebalancing of noncontrolling interest		(6,290)			(6,290)			6,290
Net income (loss)	(9,227)	(5,831)	1,018			(6,849)		(3,396)
Balance at Dec. 31, 2011	$ 309,909	$ 230,693	$ 69,000	$ 159	$ 179,919	$ (18,385)		$ 79,216
Balance (in shares) at Dec. 31, 2011				15,901,560