Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 24,209	$ 11,190	$ 108,563	$ 32,749
Other comprehensive income (loss):
Income (loss) on interest rate swaps	4,927	(6,435)	(27,273)	(29,441)
Other comprehensive income (loss)	4,927	(6,435)	(27,273)	(29,441)
Comprehensive income	29,136	4,755	81,290	3,308
Income attributable to noncontrolling interest after preferred stock dividends	(466)	(290)	(2,471)	(912)
Other comprehensive (income) loss attributable to noncontrolling interest	(145)	176	644	930
Comprehensive income attributable to STAG Industrial, Inc.	$ 28,525	$ 4,641	$ 79,463	$ 3,326