Separate Financial Information of Subsidiary Guarantors of Indebtedness (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net (loss) income	$ 30,260	$ 28,801	$ 21,361	$ 15,400	$ 8,712	$ 19,677	$ 11,777	$ 5,126	$ 95,822	$ 45,292	$ 107,936
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization									67,302	41,634	53,702
Share-based compensation expense									13,423	9,477	18,615
Excess income tax benefit from share-based compensation									(269)	(186)	(787)
Change in debt discount and deferred debt issuance costs									10,968	2,095	2,270
Deferred income taxes									(10,169)	22,214	21,460
(Gain) loss on sale of investments											1,786
(Gain) loss on sale of property and equipment									453	(2,909)	801
Other long-term liabilities									28,210	28,912	3,074
Other non-cash items									(1,874)	(3,680)	3,273
Changes in other components of working capital									(90,530)	(128,777)	(268,808)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES									113,336	14,072	(56,678)
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases									(15,743)	(35,912)	(75,013)
Proceeds from sale of property and equipment									1,899	4,980	5,335
Proceeds from sale of investments											44,497
Change in restricted cash									(4,651)	(1,483)	(1,776)
NET CASH USED IN INVESTING ACTIVITIES									(18,495)	(32,415)	(26,957)
Cash Flows from Financing Activities:
Issuance of convertible notes									200,000
Proceeds from debt									1,353,895	1,013,205	1,156,739
Repayment of debt									(1,562,684)	(1,054,371)	(1,026,349)
Payments related to business acquisitions											(26,430)
Excess income tax benefit from share-based compensation									269	186	787
Issuance of common stock and effect of cashless exercise									(584)	(808)	(1,771)
Debt issuance costs									(15,086)		(3,681)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES									(24,190)	(41,788)	99,295
Net (decrease) increase in cash and cash equivalents									70,651	(60,131)	15,660
Cash and cash equivalents at beginning of year				75,452				135,583	75,452	135,583	119,923
Cash and cash equivalents at end of year	146,103				75,452				146,103	75,452	135,583
Eliminations [Member]
Cash Flows from Operating Activities:
Net (loss) income									(113,369)	(23,367)	(95,501)
Adjustments to reconcile net income to net cash from operating activities:
Equity in earnings of subsidiaries									113,369	23,367	95,501
Cash Flows from Investing Activities:
(Increase) decrease in intercompany advances									94,732	102,763
NET CASH USED IN INVESTING ACTIVITIES									94,732	102,763
Cash Flows from Financing Activities:
Increase (decrease) in intercompany advances									(94,732)	(102,763)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES									(94,732)	(102,763)
Tutor Perini Corporation [Member]
Cash Flows from Operating Activities:
Net (loss) income									95,822	45,292	107,936
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization									31,660	8,612	2,322
Equity in earnings of subsidiaries									(113,369)	(23,367)	(95,501)
Share-based compensation expense									13,423	9,477	19,256
Excess income tax benefit from share-based compensation									(269)	(186)	(787)
Change in debt discount and deferred debt issuance costs									10,968	2,095	2,270
Adjustment interest rate swap to fair value										(224)
Deferred income taxes									2,256	1,399	39,186
(Gain) loss on sale of investments											1,786
(Gain) loss on sale of property and equipment									148	82	833
Other long-term liabilities									4,168	(3,157)	20,221
Other non-cash items									(1,125)	(248)	(7,029)
Changes in other components of working capital									(108,973)	(154,300)	(26,100)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES									(65,291)	(114,525)	64,393
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases									(1,405)	(21,587)	(17,626)
Proceeds from sale of property and equipment									164		(784)
Proceeds from sale of investments											44,497
Change in restricted cash									1,353		15,464
NET CASH USED IN INVESTING ACTIVITIES									112	(21,587)	41,551
Cash Flows from Financing Activities:
Issuance of convertible notes									200,000
Proceeds from debt									1,348,800	981,855	1,078,932
Repayment of debt									(1,523,603)	(962,701)	(957,830)
Payments related to business acquisitions											(26,430)
Excess income tax benefit from share-based compensation									269	186	787
Issuance of common stock and effect of cashless exercise									(584)	(808)	(1,772)
Debt issuance costs									(15,086)		(3,681)
Increase (decrease) in intercompany advances									89,016	89,689	(209,858)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES									98,812	108,221	(119,852)
Net (decrease) increase in cash and cash equivalents									33,633	(27,891)	(13,908)
Cash and cash equivalents at beginning of year				47,196				75,087	47,196	75,087	88,995
Cash and cash equivalents at end of year	80,829				47,196				80,829	47,196	75,087
Guarantor Subsidiaries [Member]
Cash Flows from Operating Activities:
Net (loss) income									103,288	15,959	86,089
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization									35,362	32,746	51,109
Share-based compensation expense											(641)
Adjustment interest rate swap to fair value										224
Deferred income taxes									(12,425)	36,083	(17,726)
(Gain) loss on sale of property and equipment									305	(2,991)	(32)
Other long-term liabilities									6,346	32,069	(17,147)
Other non-cash items									(749)	(3,432)	10,302
Changes in other components of working capital									46,309	49,868	(264,203)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES									178,436	160,526	(152,249)
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases									(14,338)	(14,286)	(57,387)
Proceeds from sale of property and equipment									1,735	4,980	6,119
(Increase) decrease in intercompany advances									(94,732)	(102,763)
Change in restricted cash									1,072	1,991	2,766
NET CASH USED IN INVESTING ACTIVITIES									(106,263)	(110,078)	(48,502)
Cash Flows from Financing Activities:
Proceeds from debt									5,095	31,350	77,807
Repayment of debt									(39,081)	(91,670)	(68,519)
Issuance of common stock and effect of cashless exercise											1
Increase (decrease) in intercompany advances											210,195
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES									(33,986)	(60,320)	219,484
Net (decrease) increase in cash and cash equivalents									38,187	(9,872)	18,733
Cash and cash equivalents at beginning of year				26,892				36,764	26,892	36,764	18,031
Cash and cash equivalents at end of year	65,079				26,892				65,079	26,892	36,764
Non-Guarantor Subsidiaries [Member]
Cash Flows from Operating Activities:
Net (loss) income									10,081	7,408	9,412
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization									280	276	271
Deferred income taxes										(15,268)
Other long-term liabilities									17,696
Changes in other components of working capital									(27,866)	(24,345)	21,495
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES									191	(31,929)	31,178
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases										(39)
Change in restricted cash									(7,076)	(3,474)	(20,006)
NET CASH USED IN INVESTING ACTIVITIES									(7,076)	(3,513)	(20,006)
Cash Flows from Financing Activities:
Increase (decrease) in intercompany advances									5,716	13,074	(337)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES									5,716	13,074	(337)
Net (decrease) increase in cash and cash equivalents									(1,169)	(22,368)	10,835
Cash and cash equivalents at beginning of year				$ 1,364				$ 23,732	1,364	23,732	12,897
Cash and cash equivalents at end of year	$ 195				$ 1,364				$ 195	$ 1,364	$ 23,732