SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 131,745	$ 136,587	$ 129,056	$ 117,989	$ 110,322	$ 118,336	$ 127,195	$ 118,082	$ 515,377	$ 473,935	$ 463,455
Net income	9,787	22,445	34,083	33,206	10,374	27,198	21,955	48,734	99,521	108,261	125,256
Net income attributable to Summit Hotel Properties, Inc.	$ 9,769	$ 22,390	$ 33,969	$ 33,086	$ 10,372	$ 27,083	$ 21,865	$ 48,485	$ 99,214	$ 107,805	$ 124,437
Earnings per share:
Basic (in dollars per share)	$ 0.02	$ 0.18	$ 0.30	$ 0.31					$ 0.79	$ 1.00	$ 1.25
Diluted (in dollars per share)	$ 0.02	$ 0.17	$ 0.30	$ 0.31					$ 0.79	$ 1.00	$ 1.24
Basic and diluted (in dollars per share)					$ 0.04	$ 0.25	$ 0.20	$ 0.51