Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income attributable to Tutor Perini Corporation	$ 16,034	$ 17,371
Weighted-average common shares outstanding, basic (in shares)	50,913	50,338
Effect of dilutive restricted stock units and stock options (in shares)	435	498
Weighted-average common shares outstanding, diluted (in shares)	51,348	50,836
Net income attributable to Tutor Perini Corporation per common share: Basic (in dollars per share)	$ 0.31	$ 0.35
Net income attributable to Tutor Perini Corporation per common share: Diluted (in dollars per share)	$ 0.31	$ 0.34
Anti-dilutive securities not included above (in shares)	1,640	2,209