CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ 152,337	$ (360,225)	$ 97,781
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Defined benefit pension plan adjustments	(6,261)	844	771
Foreign currency translation adjustments	279	1,337	(2,945)
Unrealized gain (loss) in fair value of investments	1,571	1,561	(778)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(4,411)	3,742	(2,952)
COMPREHENSIVE INCOME (LOSS)	147,926	(356,483)	94,829
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	44,173	27,858	14,124
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 103,753	$ (384,341)	$ 80,705