CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
NET INCOME (LOSS)	$ (360,225)	$ 97,781	$ 154,544
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Defined benefit pension plan adjustments	844	771	1,424
Foreign currency translation adjustments	1,337	(2,945)	1,273
Unrealized gain (loss) in fair value of investments	1,561	(778)	(2)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	3,742	(2,952)	2,695
COMPREHENSIVE INCOME (LOSS)	(356,483)	94,829	157,239
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	27,858	14,124	6,162
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ (384,341)	$ 80,705	$ 151,077