CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 26,241	$ 49,323	$ 92,957	$ 106,320
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Defined benefit pension plan adjustments	492	424	1,475	1,271
Foreign currency translation adjustments	(1,125)	1,102	(353)	(1,256)
Unrealized gain (loss) in fair value of investments	(448)	(225)	(1,412)	1,623
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1,081)	1,301	(290)	1,638
COMPREHENSIVE INCOME	25,160	50,624	92,667	107,958
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	10,400	13,024	30,493	32,775
COMPREHENSIVE INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 14,760	$ 37,600	$ 62,174	$ 75,183