CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
REVENUE	$ 5,318,763	$ 4,450,832	$ 4,454,662
COST OF OPERATIONS	(4,832,610)	(4,209,060)	(4,000,209)
GROSS PROFIT	486,153	241,772	454,453
General and administrative expenses	(223,809)	(226,916)	(262,577)
Goodwill impairment	0	(379,863)	0
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	262,344	(365,007)	191,876
Other income (expense)	(11,853)	6,667	4,256
Interest expense	(76,212)	(67,494)	(63,519)
INCOME (LOSS) BEFORE INCOME TAXES	174,279	(425,834)	132,613
Income tax (expense) benefit	(21,942)	65,609	(34,832)
NET INCOME (LOSS)	152,337	(360,225)	97,781
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	43,943	27,465	14,345
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 108,394	$ (387,690)	$ 83,436
Earnings Per Share, Basic (in dollars per share)	$ 2.14	$ (7.72)	$ 1.67
Earnings Per Share, Diluted (in dollars per share)	$ 2.12	$ (7.72)	$ 1.66
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	50,656	50,220	49,952
Diluted (in shares)	51,077	50,220	50,301