Summary of Significant Accounting Policies (Calculations of Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ 91,925	$ 108,394	$ (387,690)
Weighted-average common shares outstanding, basic (in shares)	51,017	50,656	50,220
Effect of dilutive restricted stock units and stock options (in shares)	352	421	0
Weighted-average common shares outstanding, diluted (in shares)	51,369	51,077	50,220
Basic (in dollars per share)	$ 1.80	$ 2.14	$ (7.72)
Diluted (in dollars per share)	$ 1.79	$ 2.12	$ (7.72)
Anti-dilutive securities not included above (in shares)	1,892	1,862	3,640