Separate Financial Information of Subsidiary Guarantors of Indebtedness, Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
CONDENSED CONSOLIDATING BALANCE SHEET
Ownership interest in guarantors	100.00%
ASSETS
Cash and Cash Equivalents	$ 106,917	$ 135,583	$ 139,858	$ 119,923
Restricted Cash	39,493	44,370
Accounts Receivable	1,553,514	1,479,504
Costs and Estimated Earnings in Excess of Billings	816,480	726,402
Deferred Income Taxes	17,952	17,962
Other Current Assets	103,243	68,735
Total current assets	2,637,599	2,472,556
Property and Equipment, net	537,833	527,602
Other Assets:
Goodwill	585,006	585,006
Intangible Assets, net	98,368	100,254
Other	84,830	87,897
Total assets	3,943,636	3,773,315
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Maturities of Long-term Debt	86,101	81,292
Accounts Payable	963,230	798,174
Billings in Excess of Costs and Estimated Earnings	263,400	319,296
Accrued Expenses and Other Current Liabilities	166,198	159,814
Total current liabilities	1,478,929	1,358,576
Long-term Debt, less current maturities	806,652	784,067
Deferred Income Taxes	150,193	150,371
Other Long-term Liabilities	$ 113,284	$ 114,796
Contingencies and Commitments
Stockholders' Equity	$ 1,394,578	$ 1,365,505
Total liabilities and stockholders' equity	3,943,636	3,773,315
Eliminations [Member]
ASSETS
Accounts Receivable	(99,091)	(103,622)
Costs and Estimated Earnings in Excess of Billings	(72,316)	(44,456)
Deferred Income Taxes		2,323
Other Current Assets	(35,656)	(37,608)
Total current assets	(207,063)	(183,363)
Intercompany Notes and Receivables	(183,867)	(122,401)
Other Assets:
Investment in Subsidiaries	(2,144,096)	(2,174,131)
Other	(5,549)	(5,453)
Total assets	(2,540,575)	(2,485,348)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts Payable	(140,520)	(109,384)
Billings in Excess of Costs and Estimated Earnings	(10,296)	(8,203)
Accrued Expenses and Other Current Liabilities	(20,978)	(26,952)
Total current liabilities	(171,794)	(144,539)
Long-term Debt, less current maturities	(40,586)	(40,453)
Intercompany Notes and Advances Payable	$ (183,867)	$ (125,992)
Contingencies and Commitments
Stockholders' Equity	$ (2,144,328)	$ (2,174,363)
Total liabilities and stockholders' equity	(2,540,575)	(2,485,347)
Tutor Perini Corporation [Member]
ASSETS
Cash and Cash Equivalents	63,130	75,087	81,385	88,995
Restricted Cash	3,369	3,369
Accounts Receivable	432,447	299,427
Costs and Estimated Earnings in Excess of Billings	87,446	70,344
Deferred Income Taxes	2,323
Other Current Assets	51,069	39,196
Total current assets	639,784	487,423
Property and Equipment, net	108,970	92,413
Other Assets:
Investment in Subsidiaries	2,144,042	2,154,562
Other	80,149	83,503
Total assets	2,972,945	2,817,901
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Maturities of Long-term Debt	40,737	34,776
Accounts Payable	239,992	186,958
Billings in Excess of Costs and Estimated Earnings	97,399	139,020
Accrued Expenses and Other Current Liabilities	22,437	33,018
Total current liabilities	400,565	393,772
Long-term Debt, less current maturities	752,931	712,460
Deferred Income Taxes	142,279	142,457
Other Long-term Liabilities	111,290	112,899
Intercompany Notes and Advances Payable	$ 152,397	$ 90,373
Contingencies and Commitments
Stockholders' Equity	$ 1,413,483	$ 1,365,939
Total liabilities and stockholders' equity	2,972,945	2,817,900
Guarantor Subsidiaries [Member]
ASSETS
Cash and Cash Equivalents	30,780	36,764	50,422	18,031
Restricted Cash	4,935	5,274
Accounts Receivable	1,180,502	1,246,635
Costs and Estimated Earnings in Excess of Billings	801,198	700,362
Deferred Income Taxes	15,629	15,639
Other Current Assets	49,382	42,750
Total current assets	2,082,426	2,047,424
Property and Equipment, net	424,659	430,876
Intercompany Notes and Receivables	183,867	122,401
Other Assets:
Goodwill	585,006	585,006
Intangible Assets, net	98,368	100,254
Investment in Subsidiaries	4	19,519
Other	10,230	9,847
Total assets	3,384,560	3,315,327
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Maturities of Long-term Debt	45,364	46,516
Accounts Payable	862,841	716,851
Billings in Excess of Costs and Estimated Earnings	176,263	185,807
Accrued Expenses and Other Current Liabilities	100,349	95,177
Total current liabilities	1,184,817	1,044,351
Long-term Debt, less current maturities	94,307	112,060
Deferred Income Taxes	7,914	7,914
Other Long-term Liabilities	$ 1,994	$ 1,897
Contingencies and Commitments
Stockholders' Equity	$ 2,095,528	$ 2,149,105
Total liabilities and stockholders' equity	3,384,560	3,315,327
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and Cash Equivalents	13,007	23,732	$ 8,051	$ 12,897
Restricted Cash	31,189	35,727
Accounts Receivable	39,656	37,064
Costs and Estimated Earnings in Excess of Billings	152	152
Other Current Assets	38,448	24,397
Total current assets	122,452	121,072
Property and Equipment, net	4,204	4,313
Other Assets:
Investment in Subsidiaries	50	50
Total assets	126,706	125,435
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts Payable	917	3,749
Billings in Excess of Costs and Estimated Earnings	34	2,672
Accrued Expenses and Other Current Liabilities	64,390	58,571
Total current liabilities	65,341	64,992
Intercompany Notes and Advances Payable	$ 31,470	$ 35,619
Contingencies and Commitments
Stockholders' Equity	$ 29,895	$ 24,824
Total liabilities and stockholders' equity	$ 126,706	$ 125,435
Senior Unsecured Notes [Member]
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate	7.625%