Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 20, 2015	Jun. 28, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	TUTOR PERINI Corp
Entity Central Index Key	0000077543
Document Type	10-K
Document Period End Date	Dec. 31, 2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,211,384,936
Entity Common Stock, Shares Outstanding		48,671,492
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY