CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
REVENUE	$ 1,207,595	$ 1,250,729
COST OF OPERATIONS	(1,097,140)	(1,139,649)
GROSS PROFIT	110,455	111,080
General and administrative expenses	(60,751)	(63,853)
INCOME FROM CONSTRUCTION OPERATIONS	49,704	47,227
Other income, net	175	481
Interest expense	(17,810)	(16,436)
INCOME BEFORE INCOME TAXES	32,069	31,272
Income tax expense	(6,964)	(5,134)
NET INCOME	25,105	26,138
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	9,071	8,767
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 16,034	$ 17,371
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.31	$ 0.35
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.31	$ 0.34
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	50,913	50,338
DILUTED (in shares)	51,348	50,836