Separate Financial Information of Subsidiary Guarantors of Indebtedness, Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	$ 1,312,438	$ 1,084,510	$ 2,378,903	$ 2,039,743
Cost of Operations	1,213,818	954,979	2,189,524	1,804,865
Gross profit	98,620	129,531	189,379	234,878
General and Administrative Expenses	67,739	64,088	138,414	127,938
INCOME FROM CONSTRUCTION OPERATIONS	30,881	65,443	50,965	106,940
Other (Expense) Income, net	100	(6,974)	(655)	(10,347)
Interest Expense	(10,989)	(10,857)	(22,113)	(21,688)
Income before income taxes	19,992	47,612	28,197	74,905
Benefit (Provision) for Income Taxes	(8,215)	(19,067)	(11,294)	(30,421)
NET INCOME	11,777	28,545	16,903	44,484
Other Comprehensive Income:
Foreign currency translation	(1,146)	347	(1,734)	61
Change in fair value of investments	(74)	(7)	(84)	174
Change in fair value of interest rate swap	60	76	105	157
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1,160)	416	(1,713)	392
TOTAL COMPREHENSIVE INCOME	10,617	28,961	15,190	44,876
Eliminations [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	(65,338)	(41,580)	(124,559)	(76,830)
Cost of Operations	(65,338)	(41,580)	(124,559)	(76,830)
Equity in Earnings of Subsidiaries	(6,586)	(31,748)	(18,526)	(47,029)
Income before income taxes	(6,586)	(31,748)	(18,526)	(47,029)
NET INCOME	(6,586)	(31,748)	(18,526)	(47,029)
Other Comprehensive Income:
Other Comprehensive Income of Subsidiaries	1,220	(340)	1,818	(235)
NET OTHER COMPREHENSIVE INCOME (LOSS)	1,220	(340)	1,818	(235)
TOTAL COMPREHENSIVE INCOME	(5,366)	(32,088)	(16,708)
Tutor Perini Corporation [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	309,217	207,944	545,509	434,791
Cost of Operations	265,129	177,877	474,962	371,691
Gross profit	44,088	30,067	70,547	63,100
General and Administrative Expenses	25,289	18,985	50,324	36,780
INCOME FROM CONSTRUCTION OPERATIONS	18,799	11,082	20,223	26,320
Equity in Earnings of Subsidiaries	6,586	31,748	18,526	47,029
Other (Expense) Income, net	(466)	(6,684)	(2,535)	(10,779)
Interest Expense	(10,134)	(9,809)	(20,397)	(19,826)
Income before income taxes	14,785	26,337	15,817	42,744
Benefit (Provision) for Income Taxes	(3,008)	2,208	1,086	1,740
NET INCOME	11,777	28,545	16,903	44,484
Other Comprehensive Income:
Other Comprehensive Income of Subsidiaries	(1,220)	340	(1,818)	235
Change in fair value of interest rate swap	60	76	105	157
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1,160)	416	(1,713)	392
TOTAL COMPREHENSIVE INCOME	10,617	28,961	15,190
Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	1,065,766	918,146	1,950,869	1,681,782
Cost of Operations	1,014,027	827,097	1,839,121	1,525,005
Gross profit	51,739	91,049	111,748	156,777
General and Administrative Expenses	41,985	44,625	87,151	90,245
INCOME FROM CONSTRUCTION OPERATIONS	9,754	46,424	24,597	66,532
Other (Expense) Income, net	431	(418)	1,627	184
Interest Expense	(855)	(1,048)	(1,716)	(1,862)
Income before income taxes	9,330	44,958	24,508	64,854
Benefit (Provision) for Income Taxes	(4,121)	(18,062)	(9,817)	(26,339)
NET INCOME	5,209	26,896	14,691	38,515
Other Comprehensive Income:
Foreign currency translation	(1,146)	347	(1,734)	61
Change in fair value of investments	(74)	(7)	(84)	174
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1,220)	340	(1,818)	235
TOTAL COMPREHENSIVE INCOME	3,989	27,236	12,873
Non-Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	2,793		7,084
Cost of Operations		(8,415)		(15,001)
Gross profit	2,793	8,415	7,084	15,001
General and Administrative Expenses	465	478	939	913
INCOME FROM CONSTRUCTION OPERATIONS	2,328	7,937	6,145	14,088
Other (Expense) Income, net	135	128	253	248
Income before income taxes	2,463	8,065	6,398	14,336
Benefit (Provision) for Income Taxes	(1,086)	(3,213)	(2,563)	(5,822)
NET INCOME	1,377	4,852	3,835	$ 8,514
Other Comprehensive Income:
TOTAL COMPREHENSIVE INCOME	$ 1,377	$ 4,852	$ 3,835