Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income attributable to Tutor Perini Corporation	$ 31,165	$ 18,709	$ 47,199	$ 36,080
Weighted-average common shares outstanding, basic (in shares)	50,999	50,667	50,956	50,502
Effect of dilutive restricted stock units and stock options (in shares)	376	268	406	383
Weighted-average common shares outstanding, diluted (in shares)	51,375	50,935	51,362	50,885
Net income attributable to Tutor Perini Corporation per common share: Basic (in dollars per share)	$ 0.61	$ 0.37	$ 0.93	$ 0.71
Net income attributable to Tutor Perini Corporation per common share: Diluted (in dollars per share)	$ 0.61	$ 0.37	$ 0.92	$ 0.71
Anti-dilutive securities not included above (in shares)	1,810	2,209	1,725	2,209