CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
REVENUE	$ 1,178,222	$ 1,442,091	$ 3,605,060	$ 3,969,247
COST OF OPERATIONS	(1,064,245)	(1,317,176)	(3,253,139)	(3,615,498)
GROSS PROFIT	113,977	124,915	351,921	353,749
General and administrative expenses	(61,884)	(41,894)	(181,371)	(165,805)
INCOME FROM CONSTRUCTION OPERATIONS	52,093	83,021	170,550	187,944
Other income (expense)	(464)	(8,048)	1,142	(8,364)
Interest expense	(16,694)	(25,613)	(52,442)	(58,513)
INCOME BEFORE INCOME TAXES	34,935	49,360	119,250	121,067
Income tax expense	(8,694)	(37)	(26,293)	(14,747)
NET INCOME	26,241	49,323	92,957	106,320
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	10,847	12,504	30,364	33,421
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 15,394	$ 36,819	$ 62,593	$ 72,899
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.30	$ 0.72	$ 1.23	$ 1.44
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.30	$ 0.72	$ 1.22	$ 1.43
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	51,072	50,787	50,995	50,598
DILUTED (in shares)	51,366	51,241	51,364	51,004