Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 464	$ 494	$ 926	$ 1,026
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(133)	(140)	(265)	(291)
Defined benefit pension plan adjustments, Net-of-Tax Amount	331	354	661	735
Foreign currency translation adjustments, Before-Tax Amount	1,072	(914)	1,551	(2,553)
Foreign currency translation adjustments, Tax (Expense) Benefit	(262)	280	(393)	745
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	810	(634)	1,158	(1,808)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	867	(1,176)	1,725	(1,295)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	(181)	247	(366)	281
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	686	(929)	1,359	(1,014)
Total other comprehensive income (loss), Before-Tax Amount	2,403	(1,596)	4,202	(2,822)
Total other comprehensive income (loss), Tax (Expense) Benefit	(576)	387	(1,024)	735
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	1,827	(1,209)	3,178	(2,087)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-of-Tax Amount	157	0	259	0
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Tax (Expense) Benefit	0	0	0	0
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount	157	0	259	0
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	2,246	(1,596)	3,943	(2,822)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	(576)	387	(1,024)	735
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ 1,670	$ (1,209)	$ 2,919	$ (2,087)

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