CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
REVENUE	$ 1,442,091,000	$ 1,189,345,000	$ 3,969,247,000	$ 3,273,107,000
COST OF OPERATIONS	(1,317,176,000)	(1,074,282,000)	(3,615,498,000)	(2,968,631,000)
GROSS PROFIT	124,915,000	115,063,000	353,749,000	304,476,000
General and administrative expenses	(41,894,000)	(67,120,000)	(165,805,000)	(195,474,000)
Goodwill impairment	0	0	0	(379,863,000)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	83,021,000	47,943,000	187,944,000	(270,861,000)
Other income (expense)	(8,048,000)	1,674,000	(8,364,000)	2,996,000
Interest expense	(25,613,000)	(17,305,000)	(58,513,000)	(51,252,000)
INCOME (LOSS) BEFORE INCOME TAXES	49,360,000	32,312,000	121,067,000	(319,117,000)
Income tax (expense) benefit	(37,000)	(5,591,000)	(14,747,000)	35,121,000
NET INCOME (LOSS)	49,323,000	26,721,000	106,320,000	(283,996,000)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	12,504,000	7,408,000	33,421,000	17,577,000
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 36,819,000	$ 19,313,000	$ 72,899,000	$ (301,573,000)
BASIC EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	$ 0.72	$ 0.38	$ 1.44	$ (6.01)
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	$ 0.72	$ 0.38	$ 1.43	$ (6.01)
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	50,787	50,279	50,598	50,201
DILUTED (in shares)	51,241	50,582	51,004	50,201