Separate Financial Information of Subsidiary Guarantors of Indebtedness, Condensed Consolidating Statement of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	$ 1,250,689	$ 1,030,388	$ 3,290,432	$ 3,076,381
Cost of Operations	1,109,848	909,531	2,914,713	2,749,212
Gross profit	140,841	120,857	375,719	327,169
General and Administrative Expenses	70,487	62,763	198,425	193,522
INCOME FROM CONSTRUCTION OPERATIONS	70,354	58,094	177,294	133,647
Other (Expense) Income, net	(441)	(9,488)	(10,788)	(13,549)
Interest Expense	(11,297)	(11,571)	(32,985)	(33,990)
Income before income taxes	58,616	37,035	133,521	86,108
Credit (Provision) for Income Taxes	(22,886)	(13,276)	(53,307)	(32,071)
NET INCOME	35,730	23,759	80,214	54,037
Other Comprehensive Income:
Tax adjustment on minimum pension liability
Foreign currency translation	(501)	(393)	(440)	(622)
Change in fair value of investments	45	(274)	219	(525)
Change in fair value of interest rate swap	129	5	286	465
NET OTHER COMPREHENSIVE INCOME (LOSS)	(327)	(662)	65	(682)
TOTAL COMPREHENSIVE INCOME	35,403	23,097	80,279	53,355
Eliminations
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	(42,303)	(29,104)	(119,133)	(134,167)
Cost of Operations	(42,303)	(29,104)	(119,133)	(134,167)
Equity in Earnings of Subsidiaries	(38,044)	(32,148)	(85,073)	(80,944)
Income before income taxes	(38,044)	(32,148)	(85,073)	(80,944)
NET INCOME	(38,044)	(32,148)	(85,073)	(80,944)
Other Comprehensive Income:
Other Comprehensive Income of Subsidiaries	456	667	221	1,147
Tax adjustment on minimum pension liability
NET OTHER COMPREHENSIVE INCOME (LOSS)	456	667	221	1,147
TOTAL COMPREHENSIVE INCOME	(37,588)	(31,481)	(84,852)	(79,797)
Tutor Perini Corporation [Member] | Reportable legal entity
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	272,657	175,160	707,448	456,732
Cost of Operations	242,717	150,560	614,408	398,072
Gross profit	29,940	24,600	93,040	58,660
General and Administrative Expenses	22,128	17,073	58,908	55,178
INCOME FROM CONSTRUCTION OPERATIONS	7,812	7,527	34,132	3,482
Equity in Earnings of Subsidiaries	38,044	32,148	85,073	80,944
Other (Expense) Income, net	(1,246)	(9,736)	(12,025)	(14,859)
Interest Expense	(10,369)	(10,655)	(30,195)	(31,500)
Income before income taxes	34,241	19,284	76,985	38,067
Credit (Provision) for Income Taxes	1,489	4,475	3,229	15,970
NET INCOME	35,730	23,759	80,214	54,037
Other Comprehensive Income:
Other Comprehensive Income of Subsidiaries	(456)	(667)	(221)	(1,147)
Tax adjustment on minimum pension liability
Change in fair value of interest rate swap	129	5	286	465
NET OTHER COMPREHENSIVE INCOME (LOSS)	(327)	(662)	65	(682)
TOTAL COMPREHENSIVE INCOME	35,403	23,097	80,279	53,355
Guarantor Subsidiaries [Member] | Reportable legal entity
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Revenues	1,020,335	884,332	2,702,117	2,753,816
Cost of Operations	913,797	794,440	2,438,802	2,499,544
Gross profit	106,538	89,892	263,315	254,272
General and Administrative Expenses	47,884	45,187	138,129	136,895
INCOME FROM CONSTRUCTION OPERATIONS	58,654	44,705	125,186	117,377
Other (Expense) Income, net	677	115	861	926
Interest Expense	(928)	(916)	(2,790)	(2,490)
Income before income taxes	58,403	43,904	123,257	115,813
Credit (Provision) for Income Taxes	(22,870)	(15,594)	(49,209)	(43,135)
NET INCOME	35,533	28,310	74,048	72,678
Other Comprehensive Income:
Tax adjustment on minimum pension liability
Foreign currency translation	(501)	(393)	(440)	(622)
Change in fair value of investments	45	(274)	219	(525)
NET OTHER COMPREHENSIVE INCOME (LOSS)	(456)	(667)	(221)	(1,147)
TOTAL COMPREHENSIVE INCOME	35,077	27,643	73,827	71,531
Non-Guarantor Subsidiaries [Member] | Reportable legal entity
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
Cost of Operations	(4,363)	(6,365)	(19,364)	(14,237)
Gross profit	4,363	6,365	19,364	14,237
General and Administrative Expenses	475	503	1,388	1,449
INCOME FROM CONSTRUCTION OPERATIONS	3,888	5,862	17,976	12,788
Equity in Earnings of Subsidiaries
Other (Expense) Income, net	128	133	376	384
Income before income taxes	4,016	5,995	18,352	13,172
Credit (Provision) for Income Taxes	(1,505)	(2,157)	(7,327)	(4,906)
NET INCOME	2,511	3,838	11,025	8,266
Other Comprehensive Income:
Tax adjustment on minimum pension liability
TOTAL COMPREHENSIVE INCOME	$ 2,511	$ 3,838	$ 11,025	$ 8,266