Summary of Significant Accounting Policies (Tax Effects of Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 8,665	$ (8,700)	$ 1,180
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(2,444)	2,439	(336)
Defined benefit pension plan adjustments, Net-of-Tax Amount	6,221	(6,261)	844
Foreign currency translation adjustment, Before-Tax Amount	(508)	178	1,867
Foreign currency translation adjustment, Tax (Expense) Benefit	183	101	(530)
Foreign currency translation adjustment, Net-of-Tax Amount	(325)	279	1,337
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	(3,440)	2,015	1,982
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	790	(444)	(421)
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	(2,650)	1,571	1,561
Total other comprehensive income (loss), Before-Tax Amount	4,717	(6,507)	5,029
Total other comprehensive income (loss), Tax (Expense) Benefit	(1,471)	2,096	(1,287)
Total other comprehensive income (loss), Net-of-Tax Amount	3,246	(4,411)	3,742
Less: Other comprehensive income attributable to noncontrolling interests, Before-Tax Amount	140	230	393
Less: Other comprehensive income attributable to noncontrolling interest, Tax (Expense) Benefit	0	0	0
Less: Other comprehensive income attributable to noncontrolling interests, Net-of-Tax Amount	140	230	393
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	4,577	(6,737)	4,636
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	(1,471)	2,096	(1,287)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Net-of-Tax Amount	$ 3,106	$ (4,641)	$ 3,349