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Summary of Significant Accounting Policies - Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Agree Realty Corporation	$ 22,559	$ 20,611	$ 18,564	$ 18,347	$ 13,212	$ 15,586	$ 12,923	$ 16,451	$ 80,081	$ 58,172	$ 58,112
Less: Income attributable to unvested restricted shares									(379)	(370)	(454)
Net income used in basic and diluted earnings per share									$ 79,702	$ 57,802	$ 57,658
Weighted average number of common shares outstanding									40,771,300	32,281,273	27,852,231
Less: Unvested restricted stock									(193,954)	(211,018)	(227,129)
Weighted average number of common shares outstanding used in basic earnings per share									40,577,346	32,070,255	27,625,102
Weighted average number of common shares outstanding used in basic earnings per share									40,577,346	32,070,255	27,625,102
Effect of dilutive securities: Share-based compensation									98,740	69,136	75,245
Weighted average number of common shares outstanding used in diluted earnings per share									41,223,614	32,401,122	27,700,347
March 2018 Forward Sale [Member]
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering										198,786
September 2018 Forward Sales
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering									269,785	62,945
April 2019 Forward Equity
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering									277,225
2019 ATM Forward Equity
Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities: forward equity offering									518

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