Changes in Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	$ 1,572,081	$ 1,442,928	$ 1,542,945	$ 1,430,525
Net income	41,611	30,859	66,716	56,997
Other comprehensive income	1,110	3,385	791	337
Share-based compensation	3,171	4,185	4,757	7,692
Issuance of common stock, net	(293)	194	(1,529)	(500)
Contributions from noncontrolling interests			4,000
Distributions to noncontrolling interests	(7,250)	(17,410)	(7,250)	(30,910)
Balance at the end of the period	1,610,430	1,464,141	1,610,430	1,464,141
Common Stock
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	50,938	50,577	50,827	50,279
Issuance of common stock, net	134	194	245	492
Balance at the end of the period	51,072	50,771	51,072	50,771
Additional Paid-in Capital
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	1,127,624	1,120,487	1,127,385	1,117,972
Share-based compensation	3,171	4,185	4,757	7,692
Issuance of common stock, net	(427)		(1,774)	(992)
Balance at the end of the period	1,130,368	1,124,672	1,130,368	1,124,672
Retained Earnings
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	438,419	331,362	422,385	313,991
Net income	31,165	18,709	47,199	36,080
Balance at the end of the period	469,584	350,071	469,584	350,071
Accumulated Other Comprehensive Loss
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(47,356)	(43,128)	(46,741)	(42,100)
Other comprehensive income	830	2,531	215	1,503
Balance at the end of the period	(46,526)	(40,597)	(46,526)	(40,597)
Noncontrolling Interests
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	2,456	(16,370)	(10,911)	(9,617)
Net income	10,446	12,150	19,517	20,917
Other comprehensive income	280	854	576	(1,166)
Contributions from noncontrolling interests			4,000
Distributions to noncontrolling interests	(7,250)	(17,410)	(7,250)	(30,910)
Balance at the end of the period	$ 5,932	$ (20,776)	$ 5,932	$ (20,776)