Consolidated and Combined Statements of Comprehensive Loss (USD $) In Thousands, 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
Net loss	$ (9,227)	$ (10,199)	$ (229)	$ (2,946)
Other comprehensive loss:
Unrealized loss on interest rate swaps		(480)
Other comprehensive loss		(480)
Comprehensive loss	(9,227)	(10,679)	(229)	(2,946)
Net Loss attributable to noncontrolling interest	3,396	3,720
Other comprehensive loss attributable to noncontrolling interest		109
Comprehensive loss attributable to STAG Industrial, Inc.	$ (5,831)	$ (6,850)	$ (229)	$ (2,946)