Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 18,265	$ 7,865	$ 21,480	$ 9,726
Loss on interest rate swap, net of tax	(53)	0	(7,114)	0
Total comprehensive income	18,212	7,865	14,366	9,726
Less: Comprehensive income attributable to noncontrolling interests	(55)	(37)	(155)	(83)
Comprehensive income attributable to Sterling common stockholders	$ 18,157	$ 7,828	$ 14,211	$ 9,643