CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 41,611	$ 30,859	$ 66,716	$ 56,997
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Defined benefit pension plan adjustments	491	424	983	847
Foreign currency translation adjustments	400	1,655	772	(2,358)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	219	1,306	(964)	1,848
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAX	1,110	3,385	791	337
COMPREHENSIVE INCOME	42,721	34,244	67,507	57,334
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	10,726	13,004	20,093	19,751
COMPREHENSIVE INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 31,995	$ 21,240	$ 47,414	$ 37,583