Separate Financial Information of Subsidiary Guarantors of Indebtedness, Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	$ 1,340,739	$ 1,250,689	$ 3,719,642	$ 3,290,432
Cost of Operations	1,240,538	1,109,848	3,430,062	2,914,713
Gross profit	100,201	140,841	289,580	375,719
General and Administrative Expenses	61,227	70,487	199,641	198,425
INCOME FROM CONSTRUCTION OPERATIONS	38,974	70,354	89,939	177,294
Other (Expense) Income, net	5,916	(441)	5,261	(10,788)
Interest Expense	(10,935)	(11,297)	(33,048)	(32,985)
Income before income taxes	33,955	58,616	62,152	133,521
Benefit (Provision) for Income Taxes	(14,278)	(22,886)	(25,572)	(53,307)
NET INCOME	19,677	35,730	36,580	80,214
Other Comprehensive Income:
Foreign currency translation	(1,375)	(501)	(3,109)	(440)
Change in fair value of investments	(2)	45	(86)	219
Change in fair value of interest rate swap	47	129	152	286
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1,330)	(327)	(3,043)	65
TOTAL COMPREHENSIVE INCOME	18,347	35,403	33,537	80,279
Eliminations [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	(85,312)	(42,303)	(209,871)	(119,133)
Cost of Operations	(85,312)	(42,303)	(209,871)	(119,133)
Equity in Earnings of Subsidiaries	(4,186)	(38,044)	(22,712)	(85,073)
Income before income taxes	(4,186)	(38,044)	(22,712)	(85,073)
NET INCOME	(4,186)	(38,044)	(22,712)	(85,073)
Other Comprehensive Income:
Other Comprehensive Income of Subsidiaries	1,377	456	3,195	221
NET OTHER COMPREHENSIVE INCOME (LOSS)	1,377	456	3,195	221
TOTAL COMPREHENSIVE INCOME	(2,809)	(37,588)	(19,517)	(84,852)
Tutor Perini Corporation [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	309,777	272,657	855,286	707,448
Cost of Operations	258,061	242,717	733,023	614,408
Gross profit	51,716	29,940	122,263	93,040
General and Administrative Expenses	19,584	22,128	69,908	58,908
INCOME FROM CONSTRUCTION OPERATIONS	32,132	7,812	52,355	34,132
Equity in Earnings of Subsidiaries	4,186	38,044	22,712	85,073
Other (Expense) Income, net	4,414	(1,246)	1,879	(12,025)
Interest Expense	(10,273)	(10,369)	(30,670)	(30,195)
Income before income taxes	30,459	34,241	46,276	76,985
Benefit (Provision) for Income Taxes	(10,782)	1,489	(9,696)	3,229
NET INCOME	19,677	35,730	36,580	80,214
Other Comprehensive Income:
Other Comprehensive Income of Subsidiaries	(1,377)	(456)	(3,195)	(221)
Change in fair value of interest rate swap	47	129	152	286
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1,330)	(327)	(3,043)	65
TOTAL COMPREHENSIVE INCOME	18,347	35,403	33,537	80,279
Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	1,111,034	1,020,335	3,061,903	2,702,117
Cost of Operations	1,067,789	913,797	2,906,910	2,438,802
Gross profit	43,245	106,538	154,993	263,315
General and Administrative Expenses	41,171	47,884	128,322	138,129
INCOME FROM CONSTRUCTION OPERATIONS	2,074	58,654	26,671	125,186
Other (Expense) Income, net	1,375	677	3,002	861
Interest Expense	(662)	(928)	(2,378)	(2,790)
Income before income taxes	2,787	58,403	27,295	123,257
Benefit (Provision) for Income Taxes	(1,413)	(22,870)	(11,230)	(49,209)
NET INCOME	1,374	35,533	16,065	74,048
Other Comprehensive Income:
Foreign currency translation	(1,375)	(501)	(3,109)	(440)
Change in fair value of investments	(2)	45	(86)	219
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1,377)	(456)	(3,195)	(221)
TOTAL COMPREHENSIVE INCOME	(3)	35,077	12,870	73,827
Non-Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	5,240		12,324
Cost of Operations		(4,363)		(19,364)
Gross profit	5,240	4,363	12,324	19,364
General and Administrative Expenses	472	475	1,411	1,388
INCOME FROM CONSTRUCTION OPERATIONS	4,768	3,888	10,913	17,976
Other (Expense) Income, net	127	128	380	376
Income before income taxes	4,895	4,016	11,293	18,352
Benefit (Provision) for Income Taxes	(2,083)	(1,505)	(4,646)	(7,327)
NET INCOME	2,812	2,511	6,647	11,025
Other Comprehensive Income:
TOTAL COMPREHENSIVE INCOME	$ 2,812	$ 2,511	$ 6,647	$ 11,025