CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
NET INCOME	$ 97,781	$ 154,544	$ 95,822
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Defined benefit pension plan adjustments	771	1,424	(2,623)
Foreign currency translation adjustments	(2,945)	1,273	(261)
Unrealized loss in fair value of investments	(778)	(2)	(340)
Unrealized loss in fair value of interest rate swap			(24)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(2,952)	2,695	(3,248)
COMPREHENSIVE INCOME	94,829	157,239	92,574
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	14,124	6,162
COMPREHENSIVE INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 80,705	$ 151,077	$ 92,574