Separate Financial Information of Subsidiary Guarantors of Indebtedness (Condensed Consolidating Statement of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	$ 1,201,877	$ 1,250,689	$ 1,084,510	$ 955,233	$ 1,099,291	$ 1,030,388	$ 1,053,065	$ 992,928	$ 4,492,309	$ 4,175,672	$ 4,111,471
Cost of operations									3,986,867	3,708,768	3,696,339
Gross profit	129,723	140,841	129,531	105,347	139,735	120,857	105,955	100,357	505,442	466,904	415,132
General and administrative expenses									263,752	263,082	260,369
Goodwill and intangible asset impairment											376,574
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	64,396	70,354	65,443	41,497	70,175	58,094	39,474	36,079	241,690	203,822	(221,811)
Other income (expense), net									(9,536)	(18,575)	(1,857)
Interest expense									(44,716)	(45,632)	(44,174)
Income (Loss) before income taxes	53,917	58,616	47,612	27,293	53,507	37,035	25,157	23,916	187,438	139,615	(267,842)
Provision for Income Taxes									(79,502)	(52,319)	2,442
NET INCOME (LOSS)	27,722	35,730	28,545	15,939	33,259	23,759	15,478	14,800	107,936	87,296	(265,400)
Other Comprehensive Income:
Change in pension benefit plans assets/liabilities									(8,155)	10,910
Tax adjustment on minimum pension liability											(1,610)
Foreign currency translation									(637)	(738)	382
Change in fair value of investments									204	(555)	238
Change in fair value of interest rate swap									348	578	(974)
Realized loss on sale of investments recorded in net income (loss)											2,005
NET OTHER COMPREHENSIVE (LOSS) INCOME									(8,240)	10,195	41
TOTAL COMPREHENSIVE INCOME (LOSS)									99,696	97,491	(265,359)
Eliminations [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues									(156,776)	179,624	(88,269)
Cost of operations									(156,776)	179,624	(88,269)
Equity in earnings of subsidiaries									(95,501)	(122,875)	225,100
Income (Loss) before income taxes									(95,501)	(122,875)	225,100
NET INCOME (LOSS)									(95,501)	(122,875)	225,100
Other Comprehensive Income:
Other comprehensive income of subsidiaries									433	1,293	(620)
NET OTHER COMPREHENSIVE (LOSS) INCOME									433	1,293	(620)
TOTAL COMPREHENSIVE INCOME (LOSS)									(95,068)	(121,582)	224,480
Tutor Perini Corporation [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues									959,010	680,440	429,926
Cost of operations									808,285	590,675	375,914
Gross profit									150,725	89,765	54,012
General and administrative expenses									80,151	77,507	71,983
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS									70,574	12,258	(17,971)
Equity in earnings of subsidiaries									95,501	122,875	(225,100)
Other income (expense), net									(8,322)	(27,162)	(2,603)
Interest expense									(40,658)	(41,987)	(40,067)
Income (Loss) before income taxes									117,095	65,984	(285,741)
Provision for Income Taxes									(9,159)	21,312	20,341
NET INCOME (LOSS)									107,936	87,296	(265,400)
Other Comprehensive Income:
Other comprehensive income of subsidiaries									(433)	(1,293)	620
Change in pension benefit plans assets/liabilities									(8,155)	10,910
Tax adjustment on minimum pension liability											(1,610)
Change in fair value of interest rate swap									348	578	(974)
Realized loss on sale of investments recorded in net income (loss)											2,005
NET OTHER COMPREHENSIVE (LOSS) INCOME									(8,240)	10,195	41
TOTAL COMPREHENSIVE INCOME (LOSS)									99,696	97,491	(265,359)
Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues									3,690,075	3,315,608	3,769,814
Cost of operations									3,353,098	2,960,569	3,421,877
Gross profit									336,977	355,039	347,937
General and administrative expenses									181,714	183,723	186,831
Goodwill and intangible asset impairment											376,574
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS									155,263	171,316	(215,468)
Other income (expense), net									(1,705)	8,075	382
Interest expense									(4,058)	(3,645)	(4,107)
Income (Loss) before income taxes									149,500	175,746	(219,193)
Provision for Income Taxes									(63,411)	(65,852)	(13,155)
NET INCOME (LOSS)									86,089	109,894	(232,348)
Other Comprehensive Income:
Foreign currency translation									(637)	(738)	382
Change in fair value of investments									204	(555)	238
NET OTHER COMPREHENSIVE (LOSS) INCOME									(433)	(1,293)	620
TOTAL COMPREHENSIVE INCOME (LOSS)									85,656	108,601	(231,728)
Non-Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Cost of operations									(17,740)	(22,100)	(13,183)
Gross profit									17,740	22,100	13,183
General and administrative expenses									1,887	1,852	1,555
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS									15,853	20,248	11,628
Other income (expense), net									491	512	364
Income (Loss) before income taxes									16,344	20,760	11,992
Provision for Income Taxes									(6,932)	(7,779)	(4,744)
NET INCOME (LOSS)									9,412	12,981	7,248
Other Comprehensive Income:
TOTAL COMPREHENSIVE INCOME (LOSS)									$ 9,412	$ 12,981	$ 7,248