Separate Financial Information of Subsidiary Guarantors of Indebtedness (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and Cash Equivalents	$ 93,622	$ 75,452	$ 106,917	$ 135,583
Restricted Cash	49,452	45,853
Accounts Receivable	1,739,343	1,473,615
Costs and Estimated Earnings in Excess of Billings	811,406	905,175
Deferred Income Taxes	19,098	26,306
Other Current Assets	76,960	108,844
Total current assets	2,789,881	2,635,245
Property and Equipment, net	507,395	523,525
Other Assets:
GOODWILL	585,006	585,006
Intangible Assets, net	94,768	96,540
OTHER ASSETS	218,535	196,361
TOTAL ASSETS	4,195,585	4,036,677
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Maturities of Long-term Debt	120,256	88,917
Accounts Payable	968,193	937,464
Billings in Excess of Costs and Estimated Earnings	325,290	288,311
Accrued Expenses and Other Current Liabilities	171,150	159,016
Total current liabilities	1,584,889	1,473,708
Long-term Debt, less current maturities	680,265	728,767
Deferred Income Taxes	296,728	273,310
Other Long-term Liabilities	140,870	140,665
Contingencies and Commitments
Stockholders' Equity	1,492,833	1,420,227
TOTAL LIABILITIES AND STOCKHOLERS' EQUITY	4,195,585	4,036,677
Eliminations [Member]
ASSETS
Accounts Receivable	(183,119)	(146,745)
Costs and Estimated Earnings in Excess of Billings	(60,222)	(77,583)
Other Current Assets	(18,985)	(11,419)
Total current assets	(262,326)	(235,747)
Intercompany Notes and Receivables	(223,736)	(148,637)
Other Assets:
Investment in Subsidiaries	(2,142,018)	(1,962,983)
OTHER ASSETS	(5,857)	(5,723)
TOTAL ASSETS	(2,633,937)	(2,353,090)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Maturities of Long-term Debt	(60,000)	(60,000)
Accounts Payable	(193,285)	(167,705)
Billings in Excess of Costs and Estimated Earnings	6,634	(5,711)
Accrued Expenses and Other Current Liabilities	(15,675)	(2,331)
Total current liabilities	(262,326)	(235,747)
Long-term Debt, less current maturities	(5,857)	(5,723)
Intercompany Notes and Advances Payable	(223,736)	(148,637)
Contingencies and Commitments
Stockholders' Equity	(2,142,018)	(1,962,983)
TOTAL LIABILITIES AND STOCKHOLERS' EQUITY	(2,633,937)	(2,353,090)
Tutor Perini Corporation [Member]
ASSETS
Cash and Cash Equivalents	56,744	47,196	63,130	75,087
Restricted Cash	3,261	3,369
Accounts Receivable	456,016	358,437
Costs and Estimated Earnings in Excess of Billings	97,028	114,580
Deferred Income Taxes	8,898	2,255
Other Current Assets	49,217	60,119
Total current assets	671,164	585,956
Property and Equipment, net	94,170	105,306
Other Assets:
Investment in Subsidiaries	2,142,018	1,962,983
OTHER ASSETS	112,252	58,722
TOTAL ASSETS	3,019,604	2,712,967
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Maturities of Long-term Debt	153,959	107,283
Accounts Payable	233,052	211,679
Billings in Excess of Costs and Estimated Earnings	114,649	89,303
Accrued Expenses and Other Current Liabilities	57,494	6,145
Total current liabilities	559,154	414,410
Long-term Debt, less current maturities	610,080	653,669
Deferred Income Taxes	62,562
Other Long-term Liabilities	108,004	106,588
Intercompany Notes and Advances Payable	186,971	118,073
Contingencies and Commitments
Stockholders' Equity	1,492,833	1,420,227
TOTAL LIABILITIES AND STOCKHOLERS' EQUITY	3,019,604	2,712,967
Guarantor Subsidiaries [Member]
ASSETS
Cash and Cash Equivalents	36,628	26,892	30,780	36,764
Restricted Cash	2,958	3,283
Accounts Receivable	1,377,164	1,179,919
Costs and Estimated Earnings in Excess of Billings	774,448	868,026
Deferred Income Taxes	10,200	21,356
Other Current Assets	37,705	48,482
Total current assets	2,239,103	2,147,958
Property and Equipment, net	409,290	414,143
Intercompany Notes and Receivables	223,736	148,637
Other Assets:
GOODWILL	585,006	585,006
Intangible Assets, net	94,768	96,540
OTHER ASSETS	86,405	128,094
TOTAL ASSETS	3,638,308	3,520,378
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Maturities of Long-term Debt	26,297	41,634
Accounts Payable	923,075	890,268
Billings in Excess of Costs and Estimated Earnings	201,483	203,003
Accrued Expenses and Other Current Liabilities	91,616	115,392
Total current liabilities	1,242,471	1,250,297
Long-term Debt, less current maturities	76,042	80,821
Deferred Income Taxes	211,828	273,310
Other Long-term Liabilities	2,312	3,278
Contingencies and Commitments
Stockholders' Equity	2,105,655	1,912,672
TOTAL LIABILITIES AND STOCKHOLERS' EQUITY	3,638,308	3,520,378
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and Cash Equivalents	250	1,364	$ 13,007	$ 23,732
Restricted Cash	43,233	39,201
Accounts Receivable	89,282	82,004
Costs and Estimated Earnings in Excess of Billings	152	152
Deferred Income Taxes		2,695
Other Current Assets	9,023	11,662
Total current assets	141,940	137,078
Property and Equipment, net	3,935	4,076
Other Assets:
OTHER ASSETS	25,735	15,268
TOTAL ASSETS	171,610	156,422
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts Payable	5,351	3,222
Billings in Excess of Costs and Estimated Earnings	2,524	1,716
Accrued Expenses and Other Current Liabilities	37,715	39,810
Total current liabilities	45,590	44,748
Deferred Income Taxes	22,338
Other Long-term Liabilities	30,554	30,799
Intercompany Notes and Advances Payable	36,765	30,564
Contingencies and Commitments
Stockholders' Equity	36,363	50,311
TOTAL LIABILITIES AND STOCKHOLERS' EQUITY	$ 171,610	$ 156,422