CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
REVENUE	$ 1,219,243	$ 1,276,427	$ 2,426,838	$ 2,527,156
COST OF OPERATIONS	(1,091,754)	(1,158,673)	(2,188,894)	(2,298,322)
GROSS PROFIT	127,489	117,754	237,944	228,834
General and administrative expenses	(58,736)	(60,058)	(119,487)	(123,911)
INCOME FROM CONSTRUCTION OPERATIONS	68,753	57,696	118,457	104,923
Other income (expense)	1,431	(797)	1,606	(316)
Interest expense	(17,938)	(16,464)	(35,748)	(32,900)
INCOME BEFORE INCOME TAXES	52,246	40,435	84,315	71,707
Income tax expense	(10,635)	(9,576)	(17,599)	(14,710)
NET INCOME	41,611	30,859	66,716	56,997
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	10,446	12,150	19,517	20,917
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 31,165	$ 18,709	$ 47,199	$ 36,080
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.61	$ 0.37	$ 0.93	$ 0.71
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.61	$ 0.37	$ 0.92	$ 0.71
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	50,999	50,667	50,956	50,502
DILUTED (in shares)	51,375	50,935	51,362	50,885