Summary of Significant Accounting Policies - Reclassification from AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	$ 2,004	$ (11,853)	$ 6,667
Income tax expense (benefit)	(25,632)	(21,942)	65,609
Net income (loss) attributable to Tutor Perini Corporation	91,925	108,394	(387,690)
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	2,861	2,407	1,933
Income tax expense (benefit)	(807)	(675)	(550)
Net income (loss) attributable to Tutor Perini Corporation	2,054	1,732	1,383
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) in Fair Value of Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	(352)	(315)	(76)
Income tax expense (benefit)	74	66	16
Net income (loss) attributable to Tutor Perini Corporation	$ (278)	$ (249)	$ (60)