SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 48,230	$ 52,412	$ 25,436	$ 108,385	$ 133,781	$ 133,685	$ 142,930	$ 138,952	$ 234,463	$ 549,348	$ 567,270
Net (loss) income	(44,708)	(35,775)	(52,548)	(16,214)	8,753	11,626	49,069	12,900	(149,245)	82,348	91,126
Net loss attributable to Summit Hotel Properties, Inc.	$ (43,054)	$ (34,546)	$ (50,417)	$ (15,322)	$ 9,242	$ 11,534	$ 48,957	$ 12,877	$ (143,339)	$ 82,610	$ 90,921
(Loss) earnings per share:
Basic and diluted (in dollars per share)	$ (0.45)	$ (0.37)	$ (0.52)	$ (0.18)	$ 0.05	$ 0.07	$ 0.43	$ 0.09	$ (1.52)	$ 0.65	$ 0.68