CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
NET INCOME	$ 27,896	$ 32,633	$ 16,954	$ 46,397
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Defined benefit pension plan adjustments	354	269	735	537
Foreign currency translation adjustments	(634)	649	(1,808)	595
Unrealized loss in fair value of investments	(929)	(3)	(1,014)	(24)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1,209)	915	(2,087)	1,108
COMPREHENSIVE INCOME	26,687	33,548	14,867	47,505
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	3,013	2,537	4,195	2,537
COMPREHENSIVE INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 23,674	$ 31,011	$ 10,672	$ 44,968

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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