Tutor Perini (TPC) 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Document and Entity Information
Entity Registrant Name	TUTOR PERINI CORP
Entity Central Index Key	77,543
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		50,025,996
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	tpc
Entity Small Business	false
Entity Emerging Growth Company	false

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
REVENUE	$ 1,123,137	$ 1,199,505	$ 3,271,378	$ 3,564,140
COST OF OPERATIONS	(1,012,013)	(1,081,254)	(2,974,546)	(3,240,332)
GROSS PROFIT	111,124	118,251	296,832	323,808
General and administrative expenses	(63,818)	(69,179)	(195,636)	(203,674)
INCOME FROM CONSTRUCTION OPERATIONS	47,306	49,072	101,196	120,134
Other income, net	1,909	967	3,739	42,373
Interest expense	(16,411)	(15,643)	(47,474)	(53,726)
INCOME BEFORE INCOME TAXES	32,804	34,396	57,461	108,781
Provision for income taxes	(7,368)	(9,096)	(15,071)	(37,084)
NET INCOME	25,436	25,300	42,390	71,697
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	4,164	1,716	8,359	4,253
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 21,272	$ 23,584	$ 34,031	$ 67,444
BASIC EARNINGS PER COMMON SHARE	$ 0.43	$ 0.47	$ 0.68	$ 1.36
DILUTED EARNINGS PER COMMON SHARE	$ 0.42	$ 0.47	$ 0.68	$ 1.33
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	50,018	49,775	49,927	49,602
DILUTED (in shares)	50,375	50,587	50,210	50,768

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
NET INCOME	$ 25,436	$ 25,300	$ 42,390	$ 71,697
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Defined benefit pension plan adjustments	365	269	1,100	806
Foreign currency translation adjustments	376	726	(1,432)	1,321
Unrealized gain (loss) in fair value of investments	(129)	12	(1,143)	(12)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	612	1,007	(1,475)	2,115
COMPREHENSIVE INCOME	26,048	26,307	40,915	73,812
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	4,164	1,716	8,359	4,253
COMPREHENSIVE INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 21,884	$ 24,591	$ 32,556	$ 69,559

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents ($32,040 and $53,067 related to variable interest entities (VIEs))	$ 118,258	$ 192,868
Restricted cash	3,436	4,780
Restricted investments	53,116	53,014
Accounts receivable ($75,999 and $30,003 related to VIEs)	1,325,465	1,265,717
Retainage receivable ($31,694 and $12,410 related to VIEs)	492,937	535,939
Costs and estimated earnings in excess of billings	1,085,651	932,758
Other current assets ($33,033 and $0 related to VIEs)	130,023	89,316
Total current assets	3,208,886	3,074,392
PROPERTY AND EQUIPMENT (P&E), net of accumulated depreciation of $345,405 and $359,188 (net P&E of $47,559 and $11,641 related to VIEs)	494,498	467,499
GOODWILL	585,006	585,006
INTANGIBLE ASSETS, NET	86,797	89,454
OTHER ASSETS	49,981	47,772
TOTAL ASSETS	4,425,168	4,264,123
CURRENT LIABILITIES:
Current maturities of long-term debt	20,601	30,748
Accounts payable ($10,793 and $19,243 related to VIEs)	611,100	699,971
Retainage payable	213,430	261,820
Billings in excess of cost and estimated earnings ($261,187 and $120,952 related to VIEs)	648,287	456,869
Accrued expenses and other current liabilities ($46,164 and $0 related to VIEs)	162,102	132,438
Total current liabilities	1,655,520	1,581,846
LONG-TERM DEBT, less current maturities, net of unamortized discounts and debt issuance costs totaling $37,749 and $45,631	780,723	705,528
DEFERRED INCOME TAXES	106,636	108,504
OTHER LONG-TERM LIABILITIES	148,917	163,465
TOTAL LIABILITIES	2,691,796	2,559,343
COMMITMENTS AND CONTINGENCIES (NOTE 9)
Stockholders' Equity:
Preferred stock - authorized 1,000,000 shares ($1 par value), none issued
Common stock - authorized 75,000,000 shares ($1 par value), issued and outstanding 50,025,996 and 49,781,010 shares	50,026	49,781
Additional paid-in capital	1,098,639	1,084,205
Retained earnings	652,276	622,007
Accumulated other comprehensive loss	(44,193)	(42,718)
Total stockholders' equity	1,756,748	1,713,275
Noncontrolling interests	(23,376)	(8,495)
TOTAL EQUITY	1,733,372	1,704,780
TOTAL LIABILITIES AND EQUITY	$ 4,425,168	$ 4,264,123

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 118,258	$ 192,868
Accounts receivable	1,325,465	1,265,717
Retainage receivable	492,937	535,939
Other current assets	130,023	89,316
Accumulated depreciation	345,405	359,188
PROPERTY AND EQUIPMENT, net of accumulated depreciation	494,498	467,499
Accounts payable	611,100	699,971
Accrued expenses and other current liabilities	162,102	132,438
Billings in excess of costs and estimated earnings	648,287	456,869
Unamortized discounts and debt issuance costs	$ 37,749	$ 45,631
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares issued	0	0
Common stock, shares authorized	75,000,000	75,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued	50,025,996	49,781,010
Common stock, shares outstanding	50,025,996	49,781,010
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents	$ 32,040	$ 53,067
Accounts receivable	75,999	30,003
Retainage receivable	31,694	12,410
Other current assets	33,033	0
PROPERTY AND EQUIPMENT, net of accumulated depreciation	47,559	11,641
Accounts payable	10,793	19,243
Accrued expenses and other current liabilities	46,164	0
Billings in excess of costs and estimated earnings	$ 261,187	$ 120,952

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net income	$ 42,390	$ 71,697
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	30,924	37,806
Amortization of intangible assets	2,657	2,657
Share-based compensation expense	17,779	16,057
Change in debt discounts and deferred debt issuance costs	8,962	14,725
Deferred income taxes	233	642
Loss (gain) on sale of property and equipment	823	(376)
Changes in other components of working capital	(136,113)	(143,213)
Other long-term liabilities	(2,606)	(2,876)
Other,net	190	4,785
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(34,761)	1,904
Cash Flows from Investing Activities:
Acquisition of property and equipment	(64,411)	(9,712)
Proceeds from sale of property and equipment	5,462	1,440
Investment in securities	(13,841)	(48,657)
Proceeds from maturities and sales of investments in securities	14,302
NET CASH USED IN INVESTING ACTIVITIES	(58,488)	(56,929)
Cash Flows from Financing Activities:
Proceeds from debt	1,502,177	1,991,457
Repayment of debt	(1,444,760)	(1,866,072)
Business acquisition related payment	(15,951)
Issuance of common stock and effect of cashless exercise	(2,671)	(11,147)
Distributions paid to noncontrolling interests	(22,500)	(2,500)
Contributions from noncontrolling interests	1,000	1,250
Debt issuance and extinguishment costs		(15,268)
NET CASH PROVIDED BY FINANCING ACTIVITIES	17,295	97,720
Net increase (decrease) in cash, cash equivalents and restricted cash	(75,954)	42,695
Cash, cash equivalents and restricted cash at beginning of period	197,648	196,607
Cash, cash equivalents and restricted cash at end of period	$ 121,694	$ 239,302

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2018
Basis of Presentation [Abstract]
Basis of Presentation	(1) Basis of Presentation  The Condensed Consolidated Financial Statements do not include footnotes and certain financial information normally presented annually under generally accepted accounting principles in the United States (“GAAP”). Therefore, they should be read in conjunction with the audited consolidated financial statements and the related notes included in Tutor Perini Corporation’s (the “Company”) Annual Report on Form 10-K for the year ended December 31, 2017. The results of operations for the three and nine months ended September 30, 2018 may not be indicative of the results that will be achieved for the full year ending December 31, 2018 .  In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements reflect all adjustments, including those of a normal recurring nature, necessary to present fairly the Company’s consolidated financial position as of September 30, 2018 and its consolidated statements of income and cash flows for the interim periods presented. Intercompany transactions of consolidated subsidiaries have been eliminated.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2018
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	(2) Recent Accounting Pronouncements  New accounting pronouncements implemented by the Company during the nine months ended September 30, 2018 are discussed below.  In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606) , as amended by subsequent ASUs (collectively, “ASC 606”). ASC 606 amends the existing accounting standards for revenue recognition and establishes principles for recognizing revenue upon the transfer of promised goods or services to customers based on the expected consideration to be received in exchange for those goods or services. The Company adopted this ASU effective January 1, 2018 using the modified retrospective transition method. The Company recognized the cumulative effect of initially applying the new revenue standard to all contracts not yet completed or substantially completed as of January 1, 2018 as an immaterial reduction to beginning retained earnings. The impact of adoption on the Company’s opening balance sheet was primarily related to the deferral of costs incurred to fulfill certain contracts that were previously recorded in income in the period incurred, but under the new standard will be capitalized and amortized over the period of contract performance. The prior year comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods; however, certain balances have been reclassified to conform to the current year presentation.  The effect of the changes made to the Company’s consolidated January 1, 2018 balance sheet for the adoption of ASC 606 were as follows:      BALANCE SHEET Balance as of Adjustments due to Balance as of  (in thousands) December 31, 2017 (a) ASC 606 January 1, 2018  ASSETS  Accounts receivable (b) $ 1,801,656 $ (535,939) $ 1,265,717  Retainage receivable (b) — 535,939 535,939  Other current assets 89,316 32,773 122,089   LIABILITIES  Accounts payable (b) $ 961,791 $ (261,820) $ 699,971  Retainage payable (b) — 261,820 261,820  Billings in excess of costs and estimated earnings 456,869 39,785 496,654  Deferred income taxes 108,504 (1,537) 106,967   EQUITY  Retained earnings $ 622,007 $ (3,762) $ 618,245  Noncontrolling interests (8,495) (1,714) (10,209) (a) Balances as previously reported on the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . (b) Prior to the adoption of ASC 606, retainage receivable and payable balances were included within accounts receivable and accounts payable, respectively.  In accordance with the new revenue standard requirements, the disclosure of the impacts of adoption on the Condensed Consolidated Statement of Income and Condensed Consolidated Balance Sheet were as follows:      Three Months Ended September 30, 2018  Balance Without  STATEMENT OF INCOME Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 1,123,137 $ 1,122,571 $ 566  COST OF OPERATIONS (1,012,013) (1,011,808) (205)  GROSS PROFIT 111,124 110,763 361  General and administrative expenses (63,818) (63,818) —  INCOME FROM CONSTRUCTION OPERATIONS 47,306 46,945 361  Other income, net 1,909 1,909 —  Interest expense (16,411) (16,411) —  INCOME BEFORE INCOME TAXES 32,804 32,443 361  Provision for income taxes (7,368) (7,303) (65)  NET INCOME 25,436 25,140 296  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 4,164 4,024 140  NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ 21,272 $ 21,116 $ 156       Nine Months Ended September 30, 2018  Balance Without  STATEMENT OF INCOME Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 3,271,378 $ 3,279,764 $ (8,386)  COST OF OPERATIONS (2,974,546) (2,981,921) 7,375  GROSS PROFIT 296,832 297,843 (1,011)  General and administrative expenses (195,636) (195,636) —  INCOME FROM CONSTRUCTION OPERATIONS 101,196 102,207 (1,011)  Other income, net 3,739 3,739 —  Interest expense (47,474) (47,474) —  INCOME BEFORE INCOME TAXES 57,461 58,472 (1,011)  Provision for income taxes (15,071) (15,358) 287  NET INCOME 42,390 43,114 (724)  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 8,359 8,379 (20)  NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ 34,031 $ 34,735 $ (704)      As of September 30, 2018  Balance Without  BALANCE SHEET Adoption of Effect of  (in thousands) As Reported ASC 606 Change  ASSETS  Accounts receivable (a) $ 1,325,465 $ 1,816,399 $ (490,934)  Retainage receivable (a) 492,937 — 492,937  Costs and estimated earnings in excess of billings 1,085,651 1,089,452 (3,801)  Other current assets 130,023 89,875 40,148   LIABILITIES  Accounts payable (a) $ 611,100 $ 824,530 $ (213,430)  Retainage payable (a) 213,430 — 213,430  Billings in excess of costs and estimated earnings 648,287 601,913 46,374  Accrued expenses and other current liabilities 162,102 162,727 (625)  Deferred income taxes 106,636 107,835 (1,199)   EQUITY  Retained earnings $ 652,276 $ 656,742 $ (4,466)  Noncontrolling interests (23,376) (21,643) (1,733) (a) Prior to the adoption of ASC 606, retainage receivable and payable balances were included within accounts receivable and payable, respectively.  The adoption of ASC 606 had no impact on the cash flows used in operating activities in the Company’s Condensed Consolidated Statement of Cash Flows.  In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash , which requires restricted cash to be included with cash and cash equivalent balances in the statement of cash flows. The Company retrospectively adopted this ASU effective January 1, 2018. The adoption of this ASU resulted in an increase of net cash used in investing activities of $ 33.1 million for the nine months ended September 30, 2017.  In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting . This ASU clarifies the scope of modification accounting under Topic 718 with respect to changes to the terms or conditions of a share-based payments award. Under this new guidance, modification accounting would not apply if a change to an award does not affect the total current fair value, vesting conditions or the classification of the award. The Company adopted this ASU effective January 1, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.  In March 2018, the FASB issued ASU 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 . This ASU provides guidance for companies that may not have completed their accounting for the income tax effects of the Tax Cut and Jobs Act of 2017 (the “Tax Act”) in the period of enactment. Staff Accounting Bulletin (“SAB”) No. 118 provides for a provisional one year measurement period to finalize the accounting for certain income tax effects related to the Tax Act and requires disclosure of the reasons for incomplete accounting. The Company applied the guidance provided in SAB No. 118 in 2017 and adopted this ASU effective January 1, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.  New accounting pronouncements requiring implementation in future periods are discussed below.  In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), as amended and supplemented by subsequent ASUs (collectively, “ASU 2016-02”). ASU 2016-02 amends the existing guidance in Accounting Standards Codification (“ASC”) 840, Leases . This ASU requires, among other things, the recognition of lease right-of-use assets and lease liabilities by lessees for those leases currently classified as operating leases. ASU 2016-02 allows companies to adopt the new standard by applying either a modified retrospective method to the beginning of the earliest period presented in the financial statements or an optional transition method to initially apply the standard on January 1, 2019 and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company expects to adopt the standard using the optional transition method. The Company has selected its leasing software solution and is in the process of identifying and implementing other changes to its business processes, systems and controls to support adoption of the new standard in 2019. The Company is currently evaluating the impact of adopting this ASU on its consolidated financial statements but expects the adoption to result in a material increase to its assets and liabilities. The Company does not expect this ASU to have a material impact on its consolidated statements of income or cash flows.  In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). This ASU simplifies the calculation of goodwill impairment by eliminating Step 2 of the impairment test prescribed by ASC 350, Intangibles—Goodwill and Other . Step 2 requires companies to calculate the implied fair value of their goodwill by estimating the fair value of their assets, other than goodwill, and liabilities, including unrecognized assets and liabilities, following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. The calculated net fair value of the assets would then be compared to the fair value of the reporting unit to determine the implied fair value of goodwill, and to the extent that the carrying value of goodwill was less than the implied fair value, a loss would be recognized. Under ASU 2017-04, however, goodwill is impaired when the calculated fair value of a reporting unit is less than its carrying value, and the impairment charge will equal that difference (i.e., impairment will be calculated at the reporting unit level and there will be no need to estimate the fair value of individual assets and liabilities). This guidance will be effective for any goodwill impairment tests performed in fiscal years beginning after December 15, 2019; however, early adoption is permitted for tests performed on testing dates after January 1, 2017. The Company expects to early adopt this ASU in the fourth quarter of 2018 and does not expect its adoption to have a material impact on its consolidated financial statements.  In February 2018, the FASB issued ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from the Accumulated Other Comprehensive Income. This ASU gives entities the option to reclassify to retained earnings tax effects related to items in accumulated other comprehensive income that the FASB refers to as having been stranded in accumulated other comprehensive income as a result of the Tax Act. Entities can apply the provisions of this ASU either in the period of adoption or retrospectively. The guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2018
Revenue [Abstract]
Revenue	(3) Revenue  Revenue Recognition  The Company derives revenue from long-term construction contracts with public and private customers primarily in the United States and its territories and in certain other international locations. The Company’s construction contracts are generally each accounted for as a single unit of account (i.e., as a single performance obligation).  Throughout the execution of construction contracts, the Company and its affiliated entities recognize revenue with the continuous transfer of control to the customer. The customer typically controls the asset under construction by either contractual termination clauses or by the Company’s rights to payment for work already performed on the asset under construction that does not have an alternative use for the Company.  Because control transfers over time, revenue is recognized to the extent of progress towards completion of the performance obligations. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the products or services provided. The Company generally uses the cost-to-cost method for its contracts, which measures progress towards completion for each performance obligation based on the ratio of costs incurred to date to the total estimated costs at completion for the respective performance obligation. Incurred cost represents work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Revenue, including estimated fees or profits, is recorded proportionately as costs are incurred. Cost of operations includes labor, materials, subcontractor costs, and other direct and indirect costs, including depreciation and amortization.  Due to the nature of the work required to be performed on many of the Company’s performance obligations, estimating total revenue and cost at completion is complex, subject to many variables and requires significant judgment. Assumptions as to the occurrence of future events and the likelihood and amount of variable consideration, including the impact of change orders, claims, contract disputes and the achievement of contractual performance criteria, and award or other incentive fees are made during the contract performance period. The Company estimates variable consideration at the most likely amount it expects to receive. The Company includes estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of anticipated performance and all information (historical, current and forecasted) that is reasonably available to management.  Disaggregation of Revenue  The following tables disaggregate revenue by end market, customer type and contract type, which the Company believes best depicts how the nature, amount, timing and uncertainty of its revenue and cash flows are affected by economic factors.      Three Months Nine Months  Ended September 30, Ended September 30,  (in thousands) 2018 2018  Civil segment revenue by end market:  Mass transit $ 177,619 $ 485,841  Bridges 128,240 311,979  Highways 46,553 129,619  Tunneling 33,377 66,009  Other 45,699 103,627  Total Civil segment revenue $ 431,488 $ 1,097,075      Three Months Nine Months  Ended September 30, Ended September 30,  (in thousands) 2018 2018  Building segment revenue by end market:  Health care facilities $ 127,219 $ 320,416  Commercial and industrial facilities 57,505 290,571  Hospitality and gaming 65,744 226,999  Municipal and government 67,003 187,984  Mixed use 40,758 121,348  Education facilities 43,405 108,763  Other 53,858 136,631  Total Building segment revenue $ 455,492 $ 1,392,712      Three Months Nine Months  Ended September 30, Ended September 30,  (in thousands) 2018 2018  Specialty Contractors segment revenue by end market:  Mass transit $ 63,457 $ 216,808  Mixed use 37,587 137,420  Commercial and industrial facilities 48,601 136,892  Education facilities 26,024 77,626  Transportation 17,150 73,154  Condominiums 18,254 64,104  Health care facilities 12,873 43,861  Other 12,211 31,726  Total Specialty Contractors segment revenue $ 236,157 $ 781,591      Three Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by customer type:  State and local agencies $ 341,067 $ 177,377 $ 99,913 $ 618,357  Federal agencies 26,944 52,890 12,058 91,892  Private owners 63,477 225,225 124,186 412,888  Total revenue $ 431,488 $ 455,492 $ 236,157 $ 1,123,137       Nine Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by customer type:  State and local agencies $ 894,613 $ 452,918 $ 312,541 $ 1,660,072  Federal agencies 67,571 149,464 45,770 262,805  Private owners 134,891 790,330 423,280 1,348,501  Total revenue $ 1,097,075 $ 1,392,712 $ 781,591 $ 3,271,378  State and local agencies . The Company’s state and local government customers include state transportation departments, metropolitan authorities, cities, municipal agencies, school districts and public universities. Services provided to state and local customers are primarily pursuant to contracts awarded through competitive bidding processes. Construction services for state and local government customers have included mass-transit systems, bridges, highways, judicial and correctional facilities, schools and dormitories, health care facilities, convention centers, parking structures and other municipal buildings. The vast majority of the Company’s civil contracting and building construction services are provided in locations throughout the United States and its territories.  Federal agencies . The Company’s federal government customers include the U.S. State Department, the U.S. Navy, the U.S. Army Corps of Engineers, the U.S. Air Force and the National Park Service. Services provided to federal agencies are typically pursuant to competitively bid contracts for specific or multi-year assignments that involve new construction or infrastructure repairs or improvements. A portion of revenue from federal agencies is derived from projects in overseas locations.  Private owners . The Company’s private customers include real estate developers, health care companies, technology companies, hospitality and gaming resort owners, Native American sovereign nations, public corporations and private universities. Services are provided to private customers through negotiated contract arrangements, as well as through competitive bids.  Most federal, state and local government contracts contain provisions that permit the termination of contracts, in whole or in part, for the convenience of government customers , among other reasons.      Three Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by contract type:  Fixed price $ 272,996 $ 91,972 $ 193,607 $ 558,575  Guaranteed maximum price 3,025 269,069 18,720 290,814  Unit price 141,917 9,938 7,939 159,794  Cost plus fee and other 13,550 84,513 15,891 113,954  Total revenue $ 431,488 $ 455,492 $ 236,157 $ 1,123,137       Nine Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by contract type:  Fixed price $ 716,826 $ 267,630 $ 675,526 $ 1,659,982  Guaranteed maximum price 11,200 801,537 51,762 864,499  Unit price 332,118 29,526 21,829 383,473  Cost plus fee and other 36,931 294,019 32,474 363,424  Total revenue $ 1,097,075 $ 1,392,712 $ 781,591 $ 3,271,378  Fixed price . Fixed price or lump sum contracts are most commonly used for projects in the Civil and Specialty Contractors segments and generally commit the Company to provide all of the resources required to complete a project for a fixed sum. Usually, fixed price contracts transfer more risk to the Company, but offer the opportunity for greater profits. Billings on fixed price contracts are typically based on estimated progress against predetermined contractual milestones.  Guaranteed maximum price (“GMP”). GMP contracts provide for a cost plus fee arrangement up to a maximum agreed upon price. These contracts place risks on the Company for amounts in excess of the GMP, but may permit an opportunity for greater profits than under cost plus fee contracts through sharing agreements with the owner on any cost savings that may be realized. Services provided by our Building segment to various private customers are often performed under GMP contracts. Billings on GMP contracts typically occur on a monthly basis and are based on actual costs incurred plus a negotiated margin.  Unit price. Unit price contracts are most prevalent for projects in the Civil and Specialty Contractors segments and generally commit the Company to provide an estimated or undetermined number of units or components that comprise a project at a fixed price per unit. This approach shifts the risk of estimating the quantity of units required to the project owner, but the risk of increased cost per unit is borne by the Company, unless otherwise allowed for in the contract. Billings on unit price contracts typically occur on a monthly basis and are based on actual quantity of work performed or comple ted during the billing period.  Cost plus fee. Cost plus fee contracts are used for many projects in the Building and Specialty Contractors segments. Cost plus fee contracts include cost plus fixed fee contracts and cost plus award fee contracts. Cost plus fixed fee contracts provide for reimbursement of approved project costs plus a fixed fee. Cost plus award fee contracts provide for reimbursement of the project costs plus a base fee, as well as an incentive fee based on cost and/or schedule performance. Cost plus fee contracts serve to minimize the Company’s financial risk, but may also limit profits. Billings on cost plus fee contracts typically occur on a monthly basis based on actual costs incurred plus a negotiated margin.  Changes in Contract Estimates that Impact Revenue  Changes to the total estimated contract revenue or cost, either due to unexpected events or revisions to management’s initial estimates, for a given project are recognized in the period in which they are determined . Net revenue recognized during the three and nine months ended September 30, 2018 related to performance obligations satisfied (or partially satisfied) in prior periods was immaterial.  Remaining Performance Obligations  Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. As of September 30, 2018, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts are $4.2 billion , $2.1 billion and $1.7 billion for the Civil, Building and Specialty Contractors segments, respectively. The Company typically recognizes revenue on Civil segment projects over a period of three to five years, whereas for projects in the Building and Specialty Contractors segments, the Company typically recognizes revenue over a period of one to three years.

Contract Assets And Liabilities

Contract Assets And Liabilities	9 Months Ended
	Sep. 30, 2018
Contract Assets and Liabilities [Abstract]
Contract Assets And Liabilities	(4) Contract Assets and Liabilities  Contract assets include amounts due under retainage provisions, costs and estimated earnings in excess of billings and capitalized contract costs. The amounts as included on the Condensed Consolidated Balance Sheets consist of the following:      As of September 30, As of January 1,  (in thousands) 2018 2018  Retainage receivable $ 492,937 $ 535,939  Costs and estimated earnings in excess of billings:  Claims 672,858 549,849  Unapproved change orders 349,286 296,591  Other unbilled costs and profits 63,507 86,318  Total costs and estimated earnings in excess of billings 1,085,651 932,758  Capitalized contract costs 41,221 32,773  Total contract assets $ 1,619,809 $ 1,501,470  Retainage receivable represents amounts invoiced to customers where payments have been partially withheld pending the completion of certain milestones, satisfaction of other contractual conditions or the completion of the project. Retainage agreements vary from project to project and balances could be outstanding for several months or years depending on a number of circumstances such as contract-specific terms, project performance and other variables that may arise as the Company makes progress towards completion.  Costs and estimated earnings in excess of billings represent the excess of contract costs and profits (or contract revenue) over the amount of contract billings to date and are classified as a current asset. Costs and estimated earnings in excess of billings result when either: 1) the appropriate contract revenue amount has been recognized over time in accordance with ASC 606, but a portion of the revenue recorded cannot be billed currently due to the billing terms defined in the contract, or 2) costs are incurred related to certain claims and unapproved change orders. Claims occur when there is a dispute regarding both a change in the scope of work and the price associated with that change. Unapproved change orders occur when a change in the scope of work results in additional work being performed before the parties have agreed on the corresponding change in the contract price. The Company routinely estimates recovery related to claims and unapproved change orders as a form of variable consideration at the most likely amount it expects to receive and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Claims and unapproved change orders are billable upon the agreement and resolution between the contractual parties and after the execution of contractual amendments. Increases in claims and unapproved change orders typically result from costs being incurred against existing or new positions; decreases normally result from resolutions and subsequent billings. As discussed in Note 9, Commitments and Contingencies , the resolution of these claims and unapproved change orders may require litigation or other forms of dispute resolution proceedings. Other unbilled costs and profits are billable in accordance with the billing terms of each of the existing contractual arrangements and, as such, the timing of contract billing cycles can cause fluctuations in the balance of unbilled costs and profits. Ultimate resolution of other unbilled costs and profits typically involves incremental progress toward contractual requirements or milestones.  Capitalized contract costs primarily represent costs to fulfill a contract that (1) directly relate to an existing or anticipated contract, (2) generate or enhance resources that will be used in satisfying performance obligations in the future and (3) are expected to be recovered through the contract, and are included in other current assets. Capitalized contract costs are generally expensed to the associated contract over the period of anticipated use on the project. During the three and nine months ended September 30, 2018 , $4.0 million and $12.2 million of previously capitalized contract costs were amortized and recognized as expense on the related contracts, respectively.  Contract liabilities include amounts owed under retainage provisions and billings in excess of costs and estimated earnings. The amount as reported on the Condensed Consolidated Balance Sheets consist of the following:      As of September 30, As of January 1,  (in thousands) 2018 2018  Retainage payable $ 213,430 $ 261,820  Billings in excess of costs and estimated earnings 648,287 496,654  Total contract liabilities $ 861,717 $ 758,474  Retainage payable represents amounts invoiced to the Company by subcontractors where payments have been partially withheld pending the completion of certain milestones, other contractual conditions or upon the completion of the project. Generally, retainage payable is not remitted to subcontractors until the associated retainage receivable from customers is collected.  Billings in excess of costs and estimated earnings represent the excess of contract billings to date over the amount of contract costs and profits (or contract revenue) recognized to date. The balance may fluctuate depending on the timing of contract billings and the recognition of contract revenue. Revenue recognized during the three and nine months ended September 30, 2018 and included in the opening billings in excess of costs and estimated earnings balances for each period totaled $ 251.4 million and $ 341.2 million, respectively.

Cash, Cash Equivalents And Rest

Cash, Cash Equivalents And Restricted Cash	9 Months Ended
	Sep. 30, 2018
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cash, Cash Equivalents and Restricted Cash	(5) Cash, Cash Equivalents and Restricted Cash  The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts shown in the Condensed Consolidated Statements of Cash Flows:      As of September 30, As of December 31,  (in thousands) 2018 2017  Cash and cash equivalents available for general corporate purposes $ 53,927 $ 94,713  Joint venture cash and cash equivalents 64,331 98,155  Cash and cash equivalents 118,258 192,868  Restricted cash 3,436 4,780  Total cash, cash equivalents and restricted cash $ 121,694 $ 197,648  Cash equivalents include short-term, highly liquid investments with maturities of three months or less when acquired. Cash and cash equivalents consist of amounts available for the Company’s general purposes, the Company’s proportionate share of cash held by the Company’s unconsolidated joint ventures and 100% of amounts held by the Company’s consolidated joint ventures. In both cases, cash held by joint ventures is available only for joint venture-related uses, including future distributions to joint venture partners.  Amounts included in restricted cash are primarily held as collateral to secure insurance-related contingent obligations, such as insurance claim deductibles, in lieu of letters of credit.

Earnings Per Common Share (EPS)

Earnings Per Common Share (EPS)	9 Months Ended
	Sep. 30, 2018
Earnings Per Common Share (EPS) [Abstract]
Earnings Per Common Share (EPS)	(6) Earnings Per Common Share (EPS)  Basic EPS and diluted EPS are calculated by dividing net income attributable to Tutor Perini Corporation by the following: for basic EPS, the weighted-average number of common shares outstanding during the period; and for diluted EPS, the sum of the weighted-average number of both outstanding common shares and potentially dilutive securities, which for the Company can include restricted stock units, unexercised stock options and the Convertible Notes, as defined in Note 8, Financial Commitments . In accordance with ASC 260, Earnings Per Share, the settlement of the principal amount of the Convertible Notes has no impact on diluted EPS because the Company has the intent and ability to settle the principal amount in cash . The Company calculates the effect of the potentially dilutive restricted stock units and stock options using the treasury stock method.     Three Months Ended September 30, Nine Months Ended September 30,  (in thousands, except per common share data) 2018 2017 2018 2017  Net income attributable to Tutor Perini Corporation $ 21,272 $ 23,584 $ 34,031 $ 67,444   Weighted-average common shares outstanding, basic 50,018 49,775 49,927 49,602  Effect of dilutive restricted stock units and stock options 357 812 283 1,166  Weighted-average common shares outstanding, diluted 50,375 50,587 50,210 50,768   Net income attributable to Tutor Perini Corporation per common share:  Basic $ 0.43 $ 0.47 $ 0.68 $ 1.36  Diluted $ 0.42 $ 0.47 $ 0.68 $ 1.33   Anti-dilutive securities not included above 2,107 912 2,765 752

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Taxes [Abstract]
Income Taxes	(7) Income Taxes  The Company’s effective income tax rate for the three and nine months ended September 30 , 2018 was 22.5% and 26.2% , respectively , and 26.4% and 34.1% for the three and nine months ended September 30, 2017, respectively. The effective tax rates for the 2018 periods reflect the reduction in the federal statutory income tax rate from 35% to 21% effective January 1, 2018 as a result of the Tax Act and were favorably impacted by the release of tax liabilities as a result of expirations of statutes of limitations and earnings attributable to noncontrolling interests for which income taxes are not the responsibility of the Company, partially offset by unfavorable rate impacts of share-based compensation-related changes . T he effective tax rates for the three and nine months ended September 30, 2017 were favorably impacted by the release of tax liabilities as a result of the expiration of statutes of limitations, earnings attributable to noncontrolling interests and favorable share-based compensation-related changes. The effective rates for the periods discussed above also reflect provisions for state income taxes.

Financial Commitments

Financial Commitments	9 Months Ended
	Sep. 30, 2018
Financial Commitments [Abstract]
Financial Commitments	(8) Financial Commitments  Long-Term Debt  Long-term debt as of September 30, 2018 and December 31, 2017 consisted of the following:      As of September 30, As of December 31,  (in thousands) 2018 2017  2017 Senior Notes $ 493,319 $ 492,734  Convertible Notes 168,932 161,635  2017 Credit Facility 78,000 —  Equipment financing and mortgages 56,227 76,820  Other indebtedness 4,846 5,087  Total debt 801,324 736,276  Less: Current maturities 20,601 30,748  Long-term debt, net $ 780,723 $ 705,528  The following table reconciles the outstanding debt balance to the reported debt balances as of September 30, 2018 and December 31, 2017:      As of September 30, 2018 As of December 31, 2017  (in thousands) Outstanding Long-Term Debt Unamortized Discount and Issuance Costs Long-Term Debt, as reported Outstanding Long-Term Debt Unamortized Discount and Issuance Costs Long-Term Debt, as reported  2017 Senior Notes $ 500,000 $ (6,681) $ 493,319 $ 500,000 $ (7,266) $ 492,734  Convertible Notes 200,000 (31,068) 168,932 200,000 (38,365) 161,635  The unamortized issuance costs related to the 2017 Credit Facility were $5.1 million and $6.2 million as of September 30, 2018 and December 31, 2017, respectively, and are included in other assets in the Condensed Consolidated Balance Sheets.  2017 Senior Notes  On April 20 , 2017, the Company issued $500 million in aggregate principal amount of 6.875% Senior Notes due 2025 (the “2017 Senior Notes”) in a private placement. Interest on the 2017 Senior Notes is payable in arrears semi-annually in May and November of each year, beginning in November 2017.  Prior to May 1, 2020, the Company may redeem the 2017 Senior Notes at a redemption price equal to 100% of their principal amount plus a “make-whole” premium described in the indenture. In addition, prior to May 1, 2020, the Company may redeem up to 40% of the original aggregate principal amount of the notes at a redemption price of 106.875% of their principal amount with the proceeds received by the Company from any offering of the Company’s equity. After May 1, 2020, the Company may redeem the 2017 Senior Notes at specified redemption prices described in the indenture. Upon a change of control, holders of the 2017 Senior Notes may require the Company to repurchase all or part of the 2017 Senior Notes at 101% of the principal amount thereof, plus accrued and unpaid interest to the redemption date.  The 2017 Senior Notes are senior unsecured obligations of the Company and are guaranteed by substantially all of the Company’s existing and future subsidiaries that also guarantee obligations under the Company’s 2017 Credit Facility, as defined below. In addition, the indenture for the 2017 Senior Notes provides for customary covenants, including events of default and restrictions on the payment of dividends and share repurchases.  2017 Credit Facility  On April 20, 2017, the Company entered into a credit agreement (the “2017 Credit Facility”) with SunTrust Bank as Administrative Agent, Swing Line Lender and L/C Issuer and a syndicate of other lenders. The 2017 Credit Facility provides for a $350 million revolving credit facility (the “2017 Revolver”) and a sublimit for the issuance of letters of credit and swingline loans up to the aggregate amount of $150 million and $10 million, respectively, both maturing on April 20, 2022, unless any of the Convertible Notes, as defined below, are outstanding on December 17, 2020, in which case all such borrowings will mature on December 17, 2020 (subject to certain further exceptions). In addition, the 2017 Credit Facility permits additional borrowings in an aggregate amount of $150 million, which can be in the form of increased capacity on the 2017 Revolver or the establishment of one or more term loans.  Borrowings under the 2017 Revolver bear interest, at the Company’s option, at a rate equal to (a) the London Interbank Offered Rate (“LIBOR”) plus a margin of between 1.50% and 3.00% or (b) a base rate (determined by reference to the highest of (i) the administrative agent’s prime lending rate, (ii) the federal funds effective rate plus 50 basis points, (iii) the LIBOR rate for a one-month interest period plus 100 basis points and (iv) 0% ), plus a margin of between 0.50% and 2.00% , in each case based on the Consolidated Leverage Ratio (as defined in the 2017 Credit Facility). In addition to paying interest on outstanding principal under the 2017 Credit Facility, the Company will pay a commitment fee to the lenders under the 2017 Revolver in respect of the unutilized commitments thereunder. The Company will pay customary letter of credit fees. If an event of default occurs and is continuing, the otherwise applicable margin and letter of credit fees will be increased by 2% per annum. The weighted-average annual interest rate on borrowings under the 2017 Revolver was approximately 4.64% during the nine months ended September 30, 2018.  The 2017 Credit Facility contains customary covenants for credit facilities of this type, including maximum consolidated leverage ratios ranging from 4.00 :1.00 to 3.25 :1.00 over the life of the facility and a minimum consolidated fixed charge coverage ratio of 1.25 :1.00. Substantially all of the Company’s subsidiaries unconditionally guarantee the obligations of the Company under the 2017 Credit Facility; additionally, the obligations are secured by a lien on all personal property of the Company and its subsidiaries guaranteeing these obligations.  As of September 30, 2018, there was $ 272 million available under the 2017 Revolver, and the Company had not utilized the 2017 Credit Facility for letters of cred it. The Company was in compliance with the financial covenants under the 2017 Credit Facility as of September 30, 2018.  Repurchase and Redemption of 2010 Senior Notes and Termination of 2014 Credit Facility  On April 20, 2017, the Company used proceeds from the 2017 Senior Notes and 2017 Revolver to repurchase or redeem its 2010 Senior Notes ( $300 million of 7.625% Senior Notes due November 1, 2018 ), to pay off its 2014 Credit Facility ( $300 million revolving credit facility and a $250 million term loan, both maturing on May 1, 2018 ), and to pay accrued but unpaid interest and fees. In addition, the indenture governing the 2010 Senior Notes was satisfied and discharged, and the Company terminated the 2014 Credit Facility.  Convertible Notes  On June 15, 2016, the Company issued $200 million of 2.875% Convertible Senior Notes due June 15, 2021 (the “Convertible Notes”) in a private placement offering. The Convertible Notes are unsecured obligations and do not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness or the issuance or repurchase of securities by the Company. The Convertible Notes bear interest at a rate of 2.875% per year, payable in cash semi-annually in June and December.  Prior to January 15, 2021, the Convertible Notes will be convertible only under the following circumstances: (1) during the five business day period after any ten consecutive trading day period in which the trading price per $1,000 principal amount of Convertible Notes for such trading day was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; (2) if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion rate of 33.0579 (or $39.32 ) on each applicable trading day; or (3) upon the occurrence of specified corporate events. On or after January 15, 2021 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their notes, in multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances.  The Convertible Notes will be convertible at an initial conversion rate of 33.0579 shares of the Company’s common stock per $1,000 principal amount of the Convertible Notes, which is equivalent to an initial conversion price of approximately $30.25 . The conversion rate will be subject to adjustment for some events but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date, the Company is required to increase, in certain circumstances, the conversion rate for a holder who elects to convert their Convertible Notes in connection with such a corporate event including customary conversion rate adjustments in connection with a “make-whole fundamental change” described in the indenture. Upon conversion, and at the Company’s election, the Company may satisfy its conversion obligation by paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock. As of September 30, 2018, the conversion provisions of the Convertible Notes have not been triggered.  Interest Expense  Interest expense as reported in the Condensed Consolidated Statements of Income consists of the following:      Three Months Ended Nine Months Ended  September 30, September 30,  (in thousands) 2018 2017 2018 2017  Cash interest expense:  Interest on 2017 Senior Notes $ 8,594 $ 8,593 $ 25,781 $ 15,373  Interest on 2017 Credit Facility 2,596 2,035 6,300 3,526  Interest on Convertible Notes 1,437 1,438 4,312 4,313  Interest on 2010 Senior Notes — — — 6,926  Interest on 2014 Credit Facility — — — 4,455  Other interest 736 802 2,119 2,495  Cash portion of loss on extinguishment — — — 1,913  Total cash interest expense 13,363 12,868 38,512 39,001   Non-cash interest expense: (a)  Amortization of discount and debt issuance costs on Convertible Notes 2,490 2,268 7,298 6,646  Amortization of debt issuance costs on 2017 Credit Facility 360 322 1,080 603  Amortization of debt issuance costs on 2017 Senior Notes 198 185 584 326  Amortization of debt issuance costs on 2014 Credit Facility — — — 1,703  Amortization of discount and debt issuance costs on 2010 Senior Notes — — — 308  Non-cash portion of loss on extinguishment — — — 5,139  Total non-cash interest expense 3,048 2,775 8,962 14,725   Total interest expense $ 16,411 $ 15,643 $ 47,474 $ 53,726 (a) The combination of cash and non-cash interest expense produces effective interest rates that are higher than contractual rates. Accordingly, the effective interest rates for the 2017 Senior Notes and the Convertible Notes were 7.13% and 9.39% , respectively, for the nine months ended September 30, 2018.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies [Abstract]
Commitments and Contingencies	(9) Commitments and Contingencies  The Company and certain of its subsidiaries are involved in litigation and various forms of dispute resolution, and are contingently liable for commitments and performance guarantees arising in the ordinary course of business. In addition, other activities inherent to the Company’s business may result in litigation or dispute resolution proceedings when there is a disagreement regarding a change in the scope of work and/or the price associated with that change. In accordance with ASC 606, the Company makes assessments of these types of disputes on a routine basis and estimates and records recovery related to these disputes at the most likely amount it expects to receive, as discussed further in Note 3, Revenue , and Note 4, Contract Assets and Liabilities. These assessments require judgments concerning matters such as litigation developments and outcomes, the anticipated outcome of negotiations and the estimated cost of resolving such disputes. In addition, because most contingencies are resolved over long periods of time, assets and liabilities may change in the future due to various factors. Management believes that, based on current information and discussions with the Company’s legal counsel, the ultimate resolution of these matters is not expected to have a material adverse effect on the Company’s financial position, results of operations or cash flows.  Several matters are in the litigation and dispute resolution processes that include characteristics which management consider to be other than ordinary routine contract performance related issues. The following discussion provides a background and current status of such material matters.  Long Island Expressway/Cross Island Parkway Matter  The Company reconstructed the Long Island Expressway/Cross Island Parkway Interchange (“LIE Project”) for the New York State Department of Transportation (“NYSDOT”). The $130 million project was substantially completed in January 2004 and was accepted by NYSDOT as complete in February 2006. The Company incurred significant added costs in completing its work and suffered extended schedule costs due to numerous design errors, undisclosed utility conflicts, lack of coordination with local agencies and other interferences for which the Company believes NYSDOT is responsible.  In March 2011, the Company opened a case with the New York State Court of Claims against NYSDOT related to the LIE Project. In May 2011, NYSDOT filed a motion to dismiss the Company’s claim on the grounds that the Company had not provided required documentation for project closeout and filing of a claim. In September 2011, the Company reached agreement on final payment with the Comptroller’s Office on behalf of NYSDOT, which resulted in an amount of $0.5 million payable to the Company and formally closed out the project allowing the Company to re-file its claim. In March 2012, the Company filed its formal Verified Claim seeking $50.7 million in damages. In May 2012, NYSDOT served its answer and asserted counterclaims in the amount of $151 million alleging fraud in the inducement and punitive damages related to alleged violations of the disadvantaged business enterprise (“DBE”) requirements for the project. The Court subsequently ruled that NYSDOT’s counterclaims may only be asserted as a defense and offset to the Company’s claims and not as affirmative claims. In November 2014, the Appellate Division First Department affirmed the dismissal of NYSDO T’s affirmative counterclaims. In June 2018, following additional summary judgment motions, the Court granted the Company’s motion to dismiss NYSDOT’s affirmative defenses, which eliminated the use of NYSDOT’s counterclaim of $151 million as a defense to the claims of the Company. In October 2018, NYSDOT filed a notice of appeal. A trial date for the appeal has not been set.  Management has made an estimate of the total anticipated recovery on this project, and such estimate is included in revenue recorded to date. To the extent new facts become known or the final recovery included in the claim settlement varies from the estimate, the impact of the change will be reflected in the consolidated financial statements at that time.  Fontainebleau Matter  Desert Mechanical, Inc. (“DMI”) and Fisk Electric Company (“Fisk”), wholly owned subsidiaries of the Company, were subcontractors on the Fontainebleau Project in Las Vegas (“Fontainebleau”), a hotel/casino complex with approximately 3,800 rooms. In June 2009, Fontainebleau filed for bankruptcy protection, under Chapter 11 of the U.S. Bankruptcy Code, in the Southern District of Florida.  DMI and Fisk filed liens in Nevada for approximately $44 million, representing unreimbursed costs to date and lost profits, including anticipated profits. Other unaffiliated subcontractors have also filed liens. In June 2009, DMI filed suit against Turnberry West Construction, Inc., the general contractor, in the 8th Judicial District Court, Clark County, Nevada, and in May 2010, the court entered an order in favor of DMI for approximately $45 million.  In January 2010, the Bankruptcy Court approved the sale of the property to Icahn Nevada Gaming Acquisition, LLC, and this transaction closed in February 2010. As a result of a July 2010 ruling rela ting to certain priming liens, approximately $125 million was set aside from this sale that is available for distribution to satisfy the creditor claims based on seniority. At that time, the total estimated sustainable lien amount was approximately $350 million. The project lender filed suit against the mechanic’s lien claimants, including DMI and Fisk, alleging that certain mechanic’s liens are invalid and that all mechanic’s liens are subordinate to the lender’s claims against the property. The Nevada Supreme Court ruled in October 2012 in an advisory opinion at the request of the Bankruptcy Court that lien priorities would be determined in favor of the mechanic lien holders under Nevada law.  In October 2013, a settlement was reached by and among the Statutory Lienholders and the other interested parties. The Bankruptcy Court appointed a mediator to facilitate the execution of that settlement agreement, but the parties were unable to settle. During the third quarter of 2017, DMI filed a motion seeking permission to file an action in Nevada to enforce the Company’s lien rights; the motion was granted by the Bankruptcy Court.  Management has made an estimate of the total anticipated recovery on this project, and such estimate is included in revenue recorded to date. To the extent new facts become known or the final recovery included in the claim settlement varies from the estimate, the impact of the change will be reflected in the consolidated financial statements at that time.  Westgate Planet Hollywood Matter  Tutor-Saliba Corporation (“TSC”), a wholly owned subsidiary of the Company, was contracted to construct a timeshare development project in Las Vegas, which was substantially completed in December 2009. The Company’s claims against the owner, Westgate Planet Hollywood Las Vegas, LLC (“WPH”), relate to unresolved owner change orders and other claims. The Company filed a lien on the project in the amount of $23.2 million and filed its complaint with the District Court, Clark County, Nevada. Several subcontractors have also recorded liens, some of which have been released by bonds and some of which have been released as a result of subsequent payment. WPH has posted a mechanic’s lien release bond for $22.3 million.  WPH filed a cross-complaint alleging non-conforming and defective work for approximately $51 million, primarily related to alleged defects, misallocated costs and liquidated damages. WPH revised the amount of their counterclaims to approximately $45 million.  Following multiple post-trial motions, final judgment was entered in this matter on March 20, 2014. TSC was awarded total judgment in the amount of $19.7 million on its breach of contract claim, which includes an award of interest up through the date of judgment, plus attorney’s fees and costs. WPH was awarded total judgment in the amount of $3.1 million on its construction defect claims, which includes interest up through the date of judgment. WPH and its Sureties have filed a notice of appeal. TSC has filed a notice of appeal on the defect award. In July 2014, the District Court ordered WPH to post an additional supersedeas bond on appeal, in the amount of $1.7 million, in addition to the lien release bond of $22.3 million, which increases the security up to $24.0 million. In May 2017, the Nevada Supreme Court issued its ruling on the appeal by WPH and its Sureties. With only minor adjustments, the Nevada Supreme Court affirmed the District C ourt’s judgment, and following further proceedings in the District C ourt, the anticipated final recovery to the Company is estimated to exceed $20 million, including interest and recovery of certain attorneys’ fees and costs of which the Company collected more than $16 million in 2017. In December 2017 and in January 2018, the District Court issued several post-appeal orders confirming its previous rulings. Some of those matters have been appealed and are expected to be resolved in the first half of 2019. Once resolved, TSC will seek an order from the District Court seeking a remaining $4 million in interest and fees associated with the matter.  The Company does not expect the ultimate resolution of this matter to have a material effect on its consolidated financial statements. Management has made an estimate of the total anticipated recovery on this project and such estimate is included in revenue recorded to date. To the extent new facts become known or the final recovery included in the claim settlement varies from the estimate, the impact of the change will be reflected in the consolidated financial statements at that time.  Five Star Electric Matter  In the third quarter of 2015, Five Star Electric Corp. (“Five Star”), a wholly owned subsidiary of the Company that was acquired in 2011, entered into a tolling agreement (which has since expired) related to an ongoing investigation being conducted by the United States Attorney’s Office for the Eastern District of New York (“USAO EDNY”). Five Star has been cooperating with the USAO EDNY since late June 2014, when it was first made aware of the investigation, and has provided information requested by the government related to its use of certain minority-owned, women-owned, small and disadvantaged business enterprises and certain of Five Star’s employee compensation, benefit and tax practices.  As of September 30, 2018, the Company cannot predict the ultimate outcome of the investigation and cannot reasonably estimate the potential loss or range of loss that Five Star or the Company may incur or the impact of the results of the investigation on Five Star or the Company.  Alaskan Way Viaduct Matter  In January 2011, Seattle Tunnel Partners (“STP”), a joint venture between Dragados USA, Inc. and the Company, entered into a design-build contract with the Washington State Department of Transportation (“WSDOT”) for the construction of a large diameter bored tunnel in downtown Seattle, King County, Washington to replace the Alaskan Way Viaduct, also known as State Route 99.  The construction of the large diameter bored tunnel required the use of a tunnel boring machine (“TBM”). In December 2013, the TBM struck a steel pipe, installed by WSDOT as a well casing for an exploratory well. The TBM was damaged and was required to be shut down for repair. STP has asserted that the steel pipe casing was a differing site condition that WSDOT failed to properly disclose. The Disputes Review Board mandated by the contract to hear disputes issued a decision finding the steel casing was a Type I differing site condition. WSDOT has not accepted that finding.  The TBM was insured under a Builder’s Risk Insurance Policy (the “Policy”) with Great Lakes Reinsurance (UK) PLC and a consortium of other insurers (the “Insurers”). STP submitted the claims to the Insurers and requested interim payments under the Policy. The Insurers refused to pay and denied coverage. In June 2015, STP filed a lawsuit in the King County Superior Court, State of Washington (“Washington Superior Court”) seeking declaratory relief concerning contract interpretation, as well as damages as a result of the Insurers’ breach of their obligations under the terms of the Policy. WSDOT is deemed a plaintiff since WSDOT is an insured under the Policy and had filed its own claim for damages. Hitachi Zosen (“Hitachi”), the manufacturer of the TBM, has also joined the case as a plaintiff for costs incurred to repair the damages to the TBM. In September 2018, rulings received on pre-trial motions effectively limited potential recovery under the Policy for STP, W SDOT and Hitachi. The Company intends to appeal these court orders. To the extent we are unable to recover damages under the Policy, we can still seek recovery against WSDOT and Hitachi as described in the next paragraph. Trial has been continued from October 2018 to February 2019.  In March 2016, WSDOT filed a complaint against STP in Thurston County Superior Court for breach of contract alleging STP’s delays and failure to perform and declaratory relief concerning contract interpretation. STP filed its answer to WSDOT’s complaint and filed a counterclaim against WSDOT and Hitachi. Trial has been continued from April 2019 to October 2019.  As of September 30, 2018, the Company has concluded that the potential for a material adverse financial impact due to the Insurers’ denial of coverage and WSDOT’s legal actions is neither probable nor remote, and the potential loss or range of loss is not reasonably estimable. With respect to STP’s claims against the Insurers, WSDOT and Hitachi, management has included an estimate of the total anticipated recovery, concluded to be both probable and reliably estimable, in receivables or costs and estimated earnings in excess of billings recorded to date. To the extent new facts become known or the final recoveries vary from the estimate, the impact of the change will be reflected in the financial statements at that time.

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2018
Share-Based Compensation [Abstract]
Share-Based Compensation	(10) Share-Based Compensation  During the second quarter of 2018, the Company adopted the Tutor Perini Corporation Omnibus Incentive Plan (the “Plan”), which effected the merger of the Company’s previous incentive compensation plans. Similar to its previous plans, the Plan provides for various types of share-based grants, including restricted and unrestricted stock units and stock options. As of September 30, 2018, there were 880,465 shares of common stock available for grant under the Company’s Plan. During the first nine months of 2018 and 2017, the Company issued the following share-based instruments: (1) restricted stock units of 614,000 and 1,055,000 with weighted-average fair values per share of $ 25.19 and $ 30.03 , respectively; (2) stock options of 579,000 and 530,000 with weighted-average fair values per share of $11.45 and $13.11 , respectively, and weighted-average per share exercise prices of $ 23.99 and $24 .64 , respectively. In addition, during the nine months ended September 30, 2018 and 2017, the Company issued 115,420 and 99,155 unrestricted stock units with a weighted-average fair value per share of $21.26 and $26.26 , respectively.  The fair value of restricted and unrestricted stock units is based on the closing price of the Company’s common stock on the New York Stock Exchange on the date of the grant and the fair value of stock options is based on the Black-Scholes model. The fair value of certain performance-based awards are estimated taking into account the features of such awards. The fair value of stock options granted during the first nine months of 2018 was determined using the Black-Scholes model based on the following weighted-average assumptions: (i) expected life of 5.1 years, (ii) expected volatility of 42.31% , (iii) risk-free rate of 2.57% , and (iv) no quarterly dividends.   For the three and nine months ended September 30, 2018, the Company recognized, as part of general and administrative expenses, costs for share-based payment arrangements totaling $5.7 million and $17.8 million, respectively, and $5.6 million and $16.1 million for the three and nine months ended September 30, 2017, respectively. As of September 30, 2018, the balance of unamortized share-based compensation expense was $30.9 million, which will be recognized over a weighted-average period of 2.1 years.

Employee Pension Plans

Employee Pension Plans	9 Months Ended
	Sep. 30, 2018
Employee Pension Plans [Abstract]
Employee Pension Plans	(11) Employee Pension Plans  The Company has a defined benefit pension plan and an unfunded supplemental retirement plan. Effective September 1, 2004, all benefit accruals under these plans were frozen; however, the current vested benefit was preserved. The pension disclosure presented below includes aggregated amounts for both of the Company’s plans.  The following table sets forth the net periodic benefit cost for the three and nine months ended September 30, 2018 and 2017 :      Three Months Ended September 30, Nine Months Ended September 30,  (in thousands) 2018 2017 2018 2017  Interest cost $ 883 $ 975 $ 2,649 $ 2,925  Expected return on plan assets (1,077) (1,088) (3,231) (3,264)  Amortization of net loss 513 456 1,539 1,368  Other 213 213 639 639  Net periodic benefit cost $ 532 $ 556 $ 1,596 $ 1,668  The Company contributed $2.1 million and $2.0 million to its defined benefit pension plan during the nine-month periods ended September 30, 2018 and 2017 , respectively, and expects to contribute an additional $0.7 million by the end of 2018 .

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Measurements [Abstract]
Fair Value Measurements	(12) Fair Value Measurements  The fair value hierarchy established by ASC 820, Fair Value Measurement , prioritizes the use of inputs used in valuation techniques into the following three levels:  · Level 1 inputs are observable quoted prices in active markets for identical assets or liabilities · Level 2 inputs are observable, either directly or indirectly, but are not Level 1 inputs · Level 3 inputs are unobservable  The following fair value hierarchy table presents the Company’s assets that are measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017:     As of September 30, 2018 As of December 31, 2017  Fair Value Hierarchy Fair Value Hierarchy  (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total  Cash and cash equivalents (a) $ 118,258 $ — $ — $ 118,258 $ 192,868 $ — $ — $ 192,868  Restricted cash (a) 3,436 — — 3,436 4,780 — — 4,780  Restricted investments (b) — 53,116 — 53,116 — — — —  Investments in lieu of retainage (c) 62,341 1,189 — 63,530 69,891 2,405 — 72,296  Other investments (b) — 4,611 — 4,611 — — — —  Total $ 184,035 $ 58,916 $ — $ 242,951 $ 267,539 $ 2,405 $ — $ 269,944 (a) Includes money market funds with original maturity dates of three months or less. (b) During the second quarter of 2018, the Company reclassified its restricted investments and other investments from the held-to-maturity category to the available-for-sale category as a result of a change in management’s investment strategy. At the time of the transfer, the securities had an aggregate amortized cost of $60.1 million and an immaterial aggregate unrealized loss. Restricted investments and other investments, as of September 30, 2018, consist of investments in corporate debt securities of $31.4 million and U.S. government agency securities of $26. 3 million, and are valued based on pricing models, which are determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets and are therefore classified as Level 2 Assets. As of December 31, 2017, restricted investments and other investments consisted of investments in U.S. agency securities of $26.1 million and corporate debt securities of $33.0 million. The maturities for restricted investments and other investments range from one month to five years. The amortized cost of these securities at September 30, 2018 and December 31, 2017 was not materially different from the fair value. Other investments are included in other current assets on the Condensed Consolidated Balance Sheets. As of December 31, 2017, the Company’s held-to-maturity restricted investments and other investments had an amortized cost of $59.6 million and fair value of $59.1 million. (c) Investments in lieu of retainage are included in retainage receivable and as of September 30, 2018 are comprised of money market funds of $62. 3 million and municipal bonds of $1. 2 million, the majority of which are rated A3 or better. The fair values of the money market funds are measured using quoted market prices; therefore, they are classified as Level 1 assets. The fair values of municipal bonds are measured using readily available pricing sources for comparable instruments; therefore, they are classified as Level 2 assets. As of December 31, 2017, investments in lieu of retainage consisted of money market funds of $69.9 million and municipal bonds of $2.4 million. The amortized cost of these available-for-sale securities at September 30, 2018 and December 31, 2017 was not materially different from the fair value.  The Company did no t have material transfers between Levels 1 and 2 during the nine months ended September 30, 2018 or 2017.  The carrying values of receivables, payables and other amounts arising out of normal contract activities, including retainage, which may be settled beyond one year, are estimated to approximate fair value. Of the Company’s long-term debt, the fair value of the 2017 Senior Notes was $517.5 million and $537.5 million as of September 30, 2018 and December 31, 2017, respectively . The fair value of the Convertible Notes was $ 202.4 million and $222.2 million as of September 30, 2018 and December 31, 2017, respectively. The fair values of the 2017 Senior Notes and Convertible Notes were determined using Level 1 inputs, specifically current observable market prices. The reported value of the Company’s remaining borrowings as of September 30, 2018 and December 31, 2017 approximates fair value.

Variable Interest Entities (VIE

Variable Interest Entities (VIE)	9 Months Ended
	Sep. 30, 2018
Variable Interest Entities (VIE) [Abstract]
Variable Interest Entities (VIE)	(13) Variable Interest Entities (VIE)  The Company may form joint ventures or partnerships with third parties for the execution of single contracts or projects. In accordance with ASC 810, Consolidation (“ASC 810”), the Company assesses its partnerships and joint ventures at inception to determine if any meet the qualifications of a VIE. The Company considers a joint venture a VIE if either (a) the total equity investment is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) characteristics of a controlling financial interest are missing (either the ability to make decisions through voting or other rights, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the entity), or (c) the voting rights of the equity holders are not proportional to their obligations to absorb the expected losses of the entity and/or their rights to receive the expected residual returns of the entity, and substantially all of the entity’s activities either involve or are conducted on behalf of an investor that has disproportionately few voting rights. Upon the occurrence of certain events outlined in ASC 810, the company reassesses its initial determination of whether the joint venture is a VIE.  ASC 810 also requires the Company to determine whether it is the primary beneficiary of the VIE. The Company concludes that it is the primary beneficiary and consolidates the VIE if the Company has both (a) the power to direct the economically significant activities of the VIE and (b) the obligation to absorb losses of, or the right to receive benefits from, the VIE that could potentially be significant to the VIE. The Company considers the contractual agreements that define the ownership structure, distribution of profits and losses, risks, responsibilities, indebtedness, voting rights and board representation of the respective parties in determining if the Company is the primary beneficiary. The Company also considers all parties that have direct or implicit variable interests when determining whether it is the primary beneficiary. In accordance with ASC 810, management’s assessment of whether the Company is the primary beneficiary of a VIE is performed continuously.  As of September 30, 2018, the Company had unconsolidated VIE-related current assets and liabilities of $8.0 million and $7.8 million, respectively, included in the Company’s Condensed Consolidated Balance Sheet. As of December 31, 2017 , the Company had unconsolidated VIE-related current assets and liabilities of $0.8 million and $0.8 million, respectively, included in the Company’s Condensed Consolidated Balance Sheet. The Company’s maximum exposure to loss as a result of its investments in unconsolidated VIEs is typically limited to the aggregate of the carrying value of the investment and future funding commitments. There were no future funding requirements for the unconsolidated VIEs as of September 30, 2018.  As of September 30, 2018, the Company’s Condensed Consolidated Balance Sheet included current and noncurrent assets of $ 172.8 million and $ 47.6 million, respectively, as well as current liabilities of $ 320.1 million, related to the operations of its consolidated VIEs. As of December 31, 2017, the Company’s Condensed Consolidated Balance Sheet included current and noncurrent assets of $95.5 million and $11.6 million, respectively, as well as current liabilities of $140.7 million related to the operations of its consolidated VIEs.  Below is a discussion of some of the Company’s more significant or unique VIEs.  The Company established a joint venture to construct the Purple Line Section 2 Extension project, a $1.4 billion mass-transit project in Los Angeles, California. The Company has a 75% interest in the joint venture with the remaining 25% held by O&G Industries, Inc. The joint venture was initially financed with contributions from the partners and, per the terms of the joint venture agreement, the partners may be required to provide additional capital contributions in the future. The Company has determined that this joint venture is a VIE for which the Company is the primary beneficiary.  The Company also established a joint venture with Parsons Corporation (“Parsons”) to construct the Newark Airport Terminal One Design-Build project, a $1.4 billion transportation infrastructure project in Newark, New Jersey. The Company has an 80% interest in the joint venture with the remaining 20% held by Parsons. The joint venture was initially financed with contributions from the partners and, per the terms of the joint venture agreement, the partners may be required to provide additional capital contributions in the future. The Company has determined that this joint venture is a VIE for which the Company is the primary beneficiary.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2018
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	(14) Other Comprehensive Income (Loss)  ASC 220, Comprehensive Income , establishes standards for reporting and displaying comprehensive income and its components in the consolidated financial statements. The Company reports the change in pension benefit plan assets/liabilities, cumulative foreign currency translation and change in fair value of investments as components of accumulated other comprehensive income (loss) (“AOCI”).  The tax effects of the components of other comprehensive income (loss) for the three months ended September 30, 2018 and 2017 are as follows:      Three Months Ended Three Months Ended  September 30, 2018 September 30, 2017  (in thousands) Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount  Other comprehensive income (loss):  Defined benefit pension plan adjustments $ 513 $ (148) $ 365 $ 456 $ (187) $ 269  Foreign currency translation adjustments 519 (143) 376 1,232 (506) 726  Unrealized gain (loss) in fair value of investments (173) 44 (129) 21 (9) 12  Total other comprehensive income (loss) 859 (247) 612 1,709 (702) 1,007  Total other comprehensive income (loss) attributable to Tutor Perini Corporation $ 859 $ (247) $ 612 $ 1,709 $ (702) $ 1,007  The tax effects of the components of other comprehensive income (loss) for the nine months ended September 30, 2018 and 2017 are as follows:      Nine Months Ended Nine Months Ended  September 30, 2018 September 30, 2017  (in thousands) Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount  Other comprehensive income (loss):  Defined benefit pension plan adjustments $ 1,539 $ (439) $ 1,100 $ 1,368 $ (562) $ 806  Foreign currency translation adjustment (2,034) 602 (1,432) 2,242 (921) 1,321  Unrealized gain (loss) in fair value of investments (1,468) 325 (1,143) (20) 8 (12)  Total other comprehensive income (loss) (1,963) 488 (1,475) 3,590 (1,475) 2,115  Total other comprehensive income (loss) attributable to Tutor Perini Corporation $ (1,963) $ 488 $ (1,475) $ 3,590 $ (1,475) $ 2,115  The changes in AOCI balances by component (after tax) during the three and nine months ended September 30, 2018 are as follows:      Three Months Ended September 30, 2018  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of June 30, 2018 $ (38,706) $ (5,399) $ (700) $ (44,805)  Other comprehensive income (loss) before reclassifications — 376 (145) 231  Amounts reclassified from AOCI 365 — 16 381  Total other comprehensive income (loss) 365 376 (129) 612  Balance as of September 30, 2018 $ (38,341) $ (5,023) $ (829) $ (44,193)      Nine Months Ended September 30, 2018  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of December 31, 2017 $ (39,441) $ (3,591) $ 314 $ (42,718)  Other comprehensive income (loss) before reclassifications — (1,432) (1,159) (2,591)  Amounts reclassified from AOCI 1,100 — 16 1,116  Total other comprehensive income (loss) 1,100 (1,432) (1,143) (1,475)  Balance as of September 30, 2018 $ (38,341) $ (5,023) $ (829) $ (44,193)  The changes in AOCI balance by component (after tax) for the three and nine months ended September 30, 2017 are as follows:     Three Months Ended September 30, 2017  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of June 30, 2017 $ (40,328) $ (4,269) $ 292 $ (44,305)  Other comprehensive income (loss) before reclassifications — 726 12 738  Amounts reclassified from AOCI 269 — — 269  Total other comprehensive income (loss) 269 726 12 1,007  Balance as of September 30, 2017 $ (40,059) $ (3,543) $ 304 $ (43,298)      Nine Months Ended September 30, 2017  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of December 31, 2016 $ (40,865) $ (4,864) $ 316 $ (45,413)  Other comprehensive income (loss) before reclassifications — 1,321 (12) 1,309  Amounts reclassified from AOCI 806 — — 806  Total other comprehensive income (loss) 806 1,321 (12) 2,115  Balance as of September 30, 2017 $ (40,059) $ (3,543) $ 304 $ (43,298)

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2018
Business Segments [Abstract]
Business Segments	(15) Business Segments  The Company offers general contracting, pre-construction planning and comprehensive project management services, including planning and scheduling of manpower, equipment, materials and subcontractors required for the timely completion of a project in accordance with the terms and specifications contained in a construction contract. The Company also offers self-performed construction services: site work, concrete forming and placement, steel erection, electrical, mechanical, plumbing, and HVAC (heating, ventilation and air conditioning). As described below, the Company’s business is conducted through three segments: Civil, Building and Specialty Contractors. These segments are determined based on how the Company’s Chairman and Chief Executive Officer (chief operating decision maker) aggregates business units when evaluating performance and allocating resources.  The Civil segment specializes in public works construction and the replacement and reconstruction of infrastructure. The civil contracting services include construction and rehabilitation of highways, bridges, tunnels, mass-transit systems, and water management and wastewater treatment facilities.  The Building segment has significant experience providing services for private and public works customers in a number of specialized building markets, including: high-rise residential, hospitality and gaming, transportation, health care, commercial and government offices, sports and entertainment, education, correctional facilities, biotech, pharmaceutical, industrial and high-tech.  The Specialty Contractors segment specializes in electrical, mechanical, plumbing, HVAC, fire protection systems and pneumatically placed concrete for a full range of civil and building construction projects in the industrial, commercial, hospitality and gaming, and mass-transit end markets. This segment provides the Company with unique strengths and capabilities that allow the Company to position itself as a full-service contractor with greater control over scheduled work, project delivery , and cost and risk management.  The following tables set forth certain reportable segment information relating to the Company’s operations for the three and nine months ended September 30, 2018 and 2017:       Reportable Segments  Specialty Consolidated  (in thousands) Civil Building Contractors Total Corporate Total  Three Months Ended September 30, 2018  Total revenue $ 479,581 $ 457,304 $ 236,157 $ 1,173,042 $ — $ 1,173,042  Elimination of intersegment revenue (48,093) (1,812) — (49,905) — (49,905)  Revenue from external customers $ 431,488 $ 455,492 $ 236,157 $ 1,123,137 $ — $ 1,123,137  Income (loss) from construction operations $ 41,282 $ 8,853 $ 11,561 $ 61,696 $ (14,390) (a) $ 47,306  Capital expenditures $ 15,364 $ 277 $ 70 $ 15,711 $ 397 $ 16,108  Depreciation and amortization (b) $ 8,031 $ 488 $ 1,081 $ 9,600 $ 2,817 $ 12,417   Three Months Ended September 30, 2017  Total revenue $ 458,487 $ 500,420 $ 310,137 $ 1,269,044 $ — $ 1,269,044  Elimination of intersegment revenue (62,667) (6,872) — (69,539) — (69,539)  Revenue from external customers $ 395,820 $ 493,548 $ 310,137 $ 1,199,505 $ — $ 1,199,505  Income (loss) from construction operations $ 38,144 $ 14,058 $ 14,575 $ 66,777 $ (17,705) (a) $ 49,072  Capital expenditures $ 1,248 $ 36 $ 81 $ 1,365 $ 164 $ 1,529  Depreciation and amortization (b) $ 5,213 $ 502 $ 1,166 $ 6,881 $ 2,824 $ 9,705 (a) Consists primarily of corporate general and administrative expenses. (b) Depreciation and amortization is included in income from construction operations.       Reportable Segments  Specialty Consolidated  (in thousands) Civil Building Contractors Total Corporate Total  Nine Months Ended September 30, 2018  Total revenue $ 1,266,595 $ 1,395,896 $ 781,591 $ 3,444,082 $ — $ 3,444,082  Elimination of intersegment revenue (169,520) (3,184) — (172,704) — (172,704)  Revenue from external customers $ 1,097,075 $ 1,392,712 $ 781,591 $ 3,271,378 $ — $ 3,271,378  Income (loss) from construction operations (a) $ 93,560 $ 27,814 $ 26,250 $ 147,624 $ (46,428) (b) $ 101,196  Capital expenditures $ 61,912 $ 1,147 $ 704 $ 63,763 $ 648 $ 64,411  Depreciation and amortization (c) $ 20,356 $ 1,458 $ 3,299 $ 25,113 $ 8,468 $ 33,581   Nine Months Ended September 30, 2017  Total revenue $ 1,363,850 $ 1,520,356 $ 907,690 $ 3,791,896 $ — $ 3,791,896  Elimination of intersegment revenue (190,873) (36,883) — (227,756) — (227,756)  Revenue from external customers $ 1,172,977 $ 1,483,473 $ 907,690 $ 3,564,140 $ — $ 3,564,140  Income (loss) from construction operations $ 128,176 $ 25,035 $ 15,330 $ 168,541 $ (48,407) (b) $ 120,134  Capital expenditures $ 8,665 $ 184 $ 374 $ 9,223 $ 489 $ 9,712  Depreciation and amortization (c) $ 26,767 $ 1,533 $ 3,551 $ 31,851 $ 8,612 $ 40,463 (a) During the nine months ended September 30, 2018, the Company recorded a charge of $17.8 million in income from construction operations (an after-tax impact of $ 12.8 million, or $ 0.25 per diluted share), which was primarily non-cash, as a result of the unexpected outcome of an arbitration decision related to a subcontract back charge dispute on a Civil segment project in New York that was completed in 2013. (b) Consists primarily of corporate general and administrative expenses. (c) Depreciation and amortization is included in income from construction operations.  A reconciliation of segment results to the consolidated income before income taxes is as follows:      Three Months Ended September 30, Nine Months Ended September 30,  (in thousands) 2018 2017 2018 2017  Income from construction operations $ 47,306 $ 49,072 $ 101,196 $ 120,134  Other income, net 1,909 967 3,739 42,373  Interest expense (16,411) (15,643) (47,474) (53,726)  Income before income taxes $ 32,804 $ 34,396 $ 57,461 $ 108,781  Total assets by segment are as follows:       As of As of  (in thousands) September 30, 2018 December 31, 2017  Civil $ 2,597,653 $ 2,452,108  Building 936,365 909,207  Specialty Contractors 760,017 767,807  Corporate and other (a) 131,133 135,001  Total assets $ 4,425,168 $ 4,264,123 (a) Consists principally of cash, equipment, tax-related assets and insurance-related assets, offset by the elimination of assets related to intersegment revenue.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	(16) Related Party Transactions  Raymond R. Oneglia, Vice Chairman of O&G Industries, Inc. (“O&G”), is a director of the Company. The Company occasionally forms construction project joint ventures with O&G. Currently, the Company has a 75% interest in a joint venture with O&G (as the 25% interest holder) to construct the Purple Line Section 2 Extension project in Los Angeles, California. O&G may provide equipment and services to these joint ventures on customary trade terms; there were no material payments made by the joint venture to O&G during the three and nine months ended September 30, 2018 and 2017.

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Policy)	9 Months Ended
	Sep. 30, 2018
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606) , as amended by subsequent ASUs (collectively, “ASC 606”). ASC 606 amends the existing accounting standards for revenue recognition and establishes principles for recognizing revenue upon the transfer of promised goods or services to customers based on the expected consideration to be received in exchange for those goods or services. The Company adopted this ASU effective January 1, 2018 using the modified retrospective transition method. The Company recognized the cumulative effect of initially applying the new revenue standard to all contracts not yet completed or substantially completed as of January 1, 2018 as an immaterial reduction to beginning retained earnings. The impact of adoption on the Company’s opening balance sheet was primarily related to the deferral of costs incurred to fulfill certain contracts that were previously recorded in income in the period incurred, but under the new standard will be capitalized and amortized over the period of contract performance. The prior year comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods; however, certain balances have been reclassified to conform to the current year presentation.  The effect of the changes made to the Company’s consolidated January 1, 2018 balance sheet for the adoption of ASC 606 were as follows:      BALANCE SHEET Balance as of Adjustments due to Balance as of  (in thousands) December 31, 2017 (a) ASC 606 January 1, 2018  ASSETS  Accounts receivable (b) $ 1,801,656 $ (535,939) $ 1,265,717  Retainage receivable (b) — 535,939 535,939  Other current assets 89,316 32,773 122,089   LIABILITIES  Accounts payable (b) $ 961,791 $ (261,820) $ 699,971  Retainage payable (b) — 261,820 261,820  Billings in excess of costs and estimated earnings 456,869 39,785 496,654  Deferred income taxes 108,504 (1,537) 106,967   EQUITY  Retained earnings $ 622,007 $ (3,762) $ 618,245  Noncontrolling interests (8,495) (1,714) (10,209) (a) Balances as previously reported on the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . (b) Prior to the adoption of ASC 606, retainage receivable and payable balances were included within accounts receivable and accounts payable, respectively.  In accordance with the new revenue standard requirements, the disclosure of the impacts of adoption on the Condensed Consolidated Statement of Income and Condensed Consolidated Balance Sheet were as follows:      Three Months Ended September 30, 2018  Balance Without  STATEMENT OF INCOME Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 1,123,137 $ 1,122,571 $ 566  COST OF OPERATIONS (1,012,013) (1,011,808) (205)  GROSS PROFIT 111,124 110,763 361  General and administrative expenses (63,818) (63,818) —  INCOME FROM CONSTRUCTION OPERATIONS 47,306 46,945 361  Other income, net 1,909 1,909 —  Interest expense (16,411) (16,411) —  INCOME BEFORE INCOME TAXES 32,804 32,443 361  Provision for income taxes (7,368) (7,303) (65)  NET INCOME 25,436 25,140 296  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 4,164 4,024 140  NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ 21,272 $ 21,116 $ 156       Nine Months Ended September 30, 2018  Balance Without  STATEMENT OF INCOME Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 3,271,378 $ 3,279,764 $ (8,386)  COST OF OPERATIONS (2,974,546) (2,981,921) 7,375  GROSS PROFIT 296,832 297,843 (1,011)  General and administrative expenses (195,636) (195,636) —  INCOME FROM CONSTRUCTION OPERATIONS 101,196 102,207 (1,011)  Other income, net 3,739 3,739 —  Interest expense (47,474) (47,474) —  INCOME BEFORE INCOME TAXES 57,461 58,472 (1,011)  Provision for income taxes (15,071) (15,358) 287  NET INCOME 42,390 43,114 (724)  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 8,359 8,379 (20)  NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ 34,031 $ 34,735 $ (704)      As of September 30, 2018  Balance Without  BALANCE SHEET Adoption of Effect of  (in thousands) As Reported ASC 606 Change  ASSETS  Accounts receivable (a) $ 1,325,465 $ 1,816,399 $ (490,934)  Retainage receivable (a) 492,937 — 492,937  Costs and estimated earnings in excess of billings 1,085,651 1,089,452 (3,801)  Other current assets 130,023 89,875 40,148   LIABILITIES  Accounts payable (a) $ 611,100 $ 824,530 $ (213,430)  Retainage payable (a) 213,430 — 213,430  Billings in excess of costs and estimated earnings 648,287 601,913 46,374  Accrued expenses and other current liabilities 162,102 162,727 (625)  Deferred income taxes 106,636 107,835 (1,199)   EQUITY  Retained earnings $ 652,276 $ 656,742 $ (4,466)  Noncontrolling interests (23,376) (21,643) (1,733) (a) Prior to the adoption of ASC 606, retainage receivable and payable balances were included within accounts receivable and payable, respectively.  The adoption of ASC 606 had no impact on the cash flows used in operating activities in the Company’s Condensed Consolidated Statement of Cash Flows.  In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash , which requires restricted cash to be included with cash and cash equivalent balances in the statement of cash flows. The Company retrospectively adopted this ASU effective January 1, 2018. The adoption of this ASU resulted in an increase of net cash used in investing activities of $ 33.1 million for the nine months ended September 30, 2017.  In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting . This ASU clarifies the scope of modification accounting under Topic 718 with respect to changes to the terms or conditions of a share-based payments award. Under this new guidance, modification accounting would not apply if a change to an award does not affect the total current fair value, vesting conditions or the classification of the award. The Company adopted this ASU effective January 1, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.  In March 2018, the FASB issued ASU 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 . This ASU provides guidance for companies that may not have completed their accounting for the income tax effects of the Tax Cut and Jobs Act of 2017 (the “Tax Act”) in the period of enactment. Staff Accounting Bulletin (“SAB”) No. 118 provides for a provisional one year measurement period to finalize the accounting for certain income tax effects related to the Tax Act and requires disclosure of the reasons for incomplete accounting. The Company applied the guidance provided in SAB No. 118 in 2017 and adopted this ASU effective January 1, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.  New accounting pronouncements requiring implementation in future periods are discussed below.  In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), as amended and supplemented by subsequent ASUs (collectively, “ASU 2016-02”). ASU 2016-02 amends the existing guidance in Accounting Standards Codification (“ASC”) 840, Leases . This ASU requires, among other things, the recognition of lease right-of-use assets and lease liabilities by lessees for those leases currently classified as operating leases. ASU 2016-02 allows companies to adopt the new standard by applying either a modified retrospective method to the beginning of the earliest period presented in the financial statements or an optional transition method to initially apply the standard on January 1, 2019 and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company expects to adopt the standard using the optional transition method. The Company has selected its leasing software solution and is in the process of identifying and implementing other changes to its business processes, systems and controls to support adoption of the new standard in 2019. The Company is currently evaluating the impact of adopting this ASU on its consolidated financial statements but expects the adoption to result in a material increase to its assets and liabilities. The Company does not expect this ASU to have a material impact on its consolidated statements of income or cash flows.  In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). This ASU simplifies the calculation of goodwill impairment by eliminating Step 2 of the impairment test prescribed by ASC 350, Intangibles—Goodwill and Other . Step 2 requires companies to calculate the implied fair value of their goodwill by estimating the fair value of their assets, other than goodwill, and liabilities, including unrecognized assets and liabilities, following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. The calculated net fair value of the assets would then be compared to the fair value of the reporting unit to determine the implied fair value of goodwill, and to the extent that the carrying value of goodwill was less than the implied fair value, a loss would be recognized. Under ASU 2017-04, however, goodwill is impaired when the calculated fair value of a reporting unit is less than its carrying value, and the impairment charge will equal that difference (i.e., impairment will be calculated at the reporting unit level and there will be no need to estimate the fair value of individual assets and liabilities). This guidance will be effective for any goodwill impairment tests performed in fiscal years beginning after December 15, 2019; however, early adoption is permitted for tests performed on testing dates after January 1, 2017. The Company expects to early adopt this ASU in the fourth quarter of 2018 and does not expect its adoption to have a material impact on its consolidated financial statements.  In February 2018, the FASB issued ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from the Accumulated Other Comprehensive Income. This ASU gives entities the option to reclassify to retained earnings tax effects related to items in accumulated other comprehensive income that the FASB refers to as having been stranded in accumulated other comprehensive income as a result of the Tax Act. Entities can apply the provisions of this ASU either in the period of adoption or retrospectively. The guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements.

Recent Accounting Pronounceme_3

Recent Accounting Pronouncements (Tables)	9 Months Ended
	Sep. 30, 2018
Recent Accounting Pronouncements [Abstract]
Schedule of the Impact for the Adoption of ASU 2014-09	The effect of the changes made to the Company’s consolidated January 1, 2018 balance sheet for the adoption of ASC 606 were as follows:      BALANCE SHEET Balance as of Adjustments due to Balance as of  (in thousands) December 31, 2017 (a) ASC 606 January 1, 2018  ASSETS  Accounts receivable (b) $ 1,801,656 $ (535,939) $ 1,265,717  Retainage receivable (b) — 535,939 535,939  Other current assets 89,316 32,773 122,089   LIABILITIES  Accounts payable (b) $ 961,791 $ (261,820) $ 699,971  Retainage payable (b) — 261,820 261,820  Billings in excess of costs and estimated earnings 456,869 39,785 496,654  Deferred income taxes 108,504 (1,537) 106,967   EQUITY  Retained earnings $ 622,007 $ (3,762) $ 618,245  Noncontrolling interests (8,495) (1,714) (10,209) (a) Balances as previously reported on the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . (b) Prior to the adoption of ASC 606, retainage receivable and payable balances were included within accounts receivable and accounts payable, respectively.  In accordance with the new revenue standard requirements, the disclosure of the impacts of adoption on the Condensed Consolidated Statement of Income and Condensed Consolidated Balance Sheet were as follows:      Three Months Ended September 30, 2018  Balance Without  STATEMENT OF INCOME Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 1,123,137 $ 1,122,571 $ 566  COST OF OPERATIONS (1,012,013) (1,011,808) (205)  GROSS PROFIT 111,124 110,763 361  General and administrative expenses (63,818) (63,818) —  INCOME FROM CONSTRUCTION OPERATIONS 47,306 46,945 361  Other income, net 1,909 1,909 —  Interest expense (16,411) (16,411) —  INCOME BEFORE INCOME TAXES 32,804 32,443 361  Provision for income taxes (7,368) (7,303) (65)  NET INCOME 25,436 25,140 296  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 4,164 4,024 140  NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ 21,272 $ 21,116 $ 156       Nine Months Ended September 30, 2018  Balance Without  STATEMENT OF INCOME Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 3,271,378 $ 3,279,764 $ (8,386)  COST OF OPERATIONS (2,974,546) (2,981,921) 7,375  GROSS PROFIT 296,832 297,843 (1,011)  General and administrative expenses (195,636) (195,636) —  INCOME FROM CONSTRUCTION OPERATIONS 101,196 102,207 (1,011)  Other income, net 3,739 3,739 —  Interest expense (47,474) (47,474) —  INCOME BEFORE INCOME TAXES 57,461 58,472 (1,011)  Provision for income taxes (15,071) (15,358) 287  NET INCOME 42,390 43,114 (724)  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 8,359 8,379 (20)  NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ 34,031 $ 34,735 $ (704)      As of September 30, 2018  Balance Without  BALANCE SHEET Adoption of Effect of  (in thousands) As Reported ASC 606 Change  ASSETS  Accounts receivable (a) $ 1,325,465 $ 1,816,399 $ (490,934)  Retainage receivable (a) 492,937 — 492,937  Costs and estimated earnings in excess of billings 1,085,651 1,089,452 (3,801)  Other current assets 130,023 89,875 40,148   LIABILITIES  Accounts payable (a) $ 611,100 $ 824,530 $ (213,430)  Retainage payable (a) 213,430 — 213,430  Billings in excess of costs and estimated earnings 648,287 601,913 46,374  Accrued expenses and other current liabilities 162,102 162,727 (625)  Deferred income taxes 106,636 107,835 (1,199)   EQUITY  Retained earnings $ 652,276 $ 656,742 $ (4,466)  Noncontrolling interests (23,376) (21,643) (1,733) (a) Prior to the adoption of ASC 606, retainage receivable and payable balances were included within accounts receivable and payable, respectively.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue [Abstract]
Disaggregation Of Revenue	Disaggregation of Revenue  The following tables disaggregate revenue by end market, customer type and contract type, which the Company believes best depicts how the nature, amount, timing and uncertainty of its revenue and cash flows are affected by economic factors.      Three Months Nine Months  Ended September 30, Ended September 30,  (in thousands) 2018 2018  Civil segment revenue by end market:  Mass transit $ 177,619 $ 485,841  Bridges 128,240 311,979  Highways 46,553 129,619  Tunneling 33,377 66,009  Other 45,699 103,627  Total Civil segment revenue $ 431,488 $ 1,097,075      Three Months Nine Months  Ended September 30, Ended September 30,  (in thousands) 2018 2018  Building segment revenue by end market:  Health care facilities $ 127,219 $ 320,416  Commercial and industrial facilities 57,505 290,571  Hospitality and gaming 65,744 226,999  Municipal and government 67,003 187,984  Mixed use 40,758 121,348  Education facilities 43,405 108,763  Other 53,858 136,631  Total Building segment revenue $ 455,492 $ 1,392,712      Three Months Nine Months  Ended September 30, Ended September 30,  (in thousands) 2018 2018  Specialty Contractors segment revenue by end market:  Mass transit $ 63,457 $ 216,808  Mixed use 37,587 137,420  Commercial and industrial facilities 48,601 136,892  Education facilities 26,024 77,626  Transportation 17,150 73,154  Condominiums 18,254 64,104  Health care facilities 12,873 43,861  Other 12,211 31,726  Total Specialty Contractors segment revenue $ 236,157 $ 781,591      Three Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by customer type:  State and local agencies $ 341,067 $ 177,377 $ 99,913 $ 618,357  Federal agencies 26,944 52,890 12,058 91,892  Private owners 63,477 225,225 124,186 412,888  Total revenue $ 431,488 $ 455,492 $ 236,157 $ 1,123,137       Nine Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by customer type:  State and local agencies $ 894,613 $ 452,918 $ 312,541 $ 1,660,072  Federal agencies 67,571 149,464 45,770 262,805  Private owners 134,891 790,330 423,280 1,348,501  Total revenue $ 1,097,075 $ 1,392,712 $ 781,591 $ 3,271,378  State and local agencies . The Company’s state and local government customers include state transportation departments, metropolitan authorities, cities, municipal agencies, school districts and public universities. Services provided to state and local customers are primarily pursuant to contracts awarded through competitive bidding processes. Construction services for state and local government customers have included mass-transit systems, bridges, highways, judicial and correctional facilities, schools and dormitories, health care facilities, convention centers, parking structures and other municipal buildings. The vast majority of the Company’s civil contracting and building construction services are provided in locations throughout the United States and its territories.  Federal agencies . The Company’s federal government customers include the U.S. State Department, the U.S. Navy, the U.S. Army Corps of Engineers, the U.S. Air Force and the National Park Service. Services provided to federal agencies are typically pursuant to competitively bid contracts for specific or multi-year assignments that involve new construction or infrastructure repairs or improvements. A portion of revenue from federal agencies is derived from projects in overseas locations.  Private owners . The Company’s private customers include real estate developers, health care companies, technology companies, hospitality and gaming resort owners, Native American sovereign nations, public corporations and private universities. Services are provided to private customers through negotiated contract arrangements, as well as through competitive bids.  Most federal, state and local government contracts contain provisions that permit the termination of contracts, in whole or in part, for the convenience of government customers , among other reasons.      Three Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by contract type:  Fixed price $ 272,996 $ 91,972 $ 193,607 $ 558,575  Guaranteed maximum price 3,025 269,069 18,720 290,814  Unit price 141,917 9,938 7,939 159,794  Cost plus fee and other 13,550 84,513 15,891 113,954  Total revenue $ 431,488 $ 455,492 $ 236,157 $ 1,123,137       Nine Months Ended September 30, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by contract type:  Fixed price $ 716,826 $ 267,630 $ 675,526 $ 1,659,982  Guaranteed maximum price 11,200 801,537 51,762 864,499  Unit price 332,118 29,526 21,829 383,473  Cost plus fee and other 36,931 294,019 32,474 363,424  Total revenue $ 1,097,075 $ 1,392,712 $ 781,591 $ 3,271,378  Fixed price . Fixed price or lump sum contracts are most commonly used for projects in the Civil and Specialty Contractors segments and generally commit the Company to provide all of the resources required to complete a project for a fixed sum. Usually, fixed price contracts transfer more risk to the Company, but offer the opportunity for greater profits. Billings on fixed price contracts are typically based on estimated progress against predetermined contractual milestones.  Guaranteed maximum price (“GMP”). GMP contracts provide for a cost plus fee arrangement up to a maximum agreed upon price. These contracts place risks on the Company for amounts in excess of the GMP, but may permit an opportunity for greater profits than under cost plus fee contracts through sharing agreements with the owner on any cost savings that may be realized. Services provided by our Building segment to various private customers are often performed under GMP contracts. Billings on GMP contracts typically occur on a monthly basis and are based on actual costs incurred plus a negotiated margin.  Unit price. Unit price contracts are most prevalent for projects in the Civil and Specialty Contractors segments and generally commit the Company to provide an estimated or undetermined number of units or components that comprise a project at a fixed price per unit. This approach shifts the risk of estimating the quantity of units required to the project owner, but the risk of increased cost per unit is borne by the Company, unless otherwise allowed for in the contract. Billings on unit price contracts typically occur on a monthly basis and are based on actual quantity of work performed or comple ted during the billing period.  Cost plus fee. Cost plus fee contracts are used for many projects in the Building and Specialty Contractors segments. Cost plus fee contracts include cost plus fixed fee contracts and cost plus award fee contracts. Cost plus fixed fee contracts provide for reimbursement of approved project costs plus a fixed fee. Cost plus award fee contracts provide for reimbursement of the project costs plus a base fee, as well as an incentive fee based on cost and/or schedule performance. Cost plus fee contracts serve to minimize the Company’s financial risk, but may also limit profits. Billings on cost plus fee contracts typically occur on a monthly basis based on actual costs incurred plus a negotiated margin.

Contract Assets And Liabiliti_2

Contract Assets And Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Contract Assets and Liabilities [Abstract]
Schedule Of Contract Assets And Liabilities	    As of September 30, As of January 1,  (in thousands) 2018 2018  Retainage receivable $ 492,937 $ 535,939  Costs and estimated earnings in excess of billings:  Claims 672,858 549,849  Unapproved change orders 349,286 296,591  Other unbilled costs and profits 63,507 86,318  Total costs and estimated earnings in excess of billings 1,085,651 932,758  Capitalized contract costs 41,221 32,773  Total contract assets $ 1,619,809 $ 1,501,470  Retainage receivable represents amounts invoiced to customers where payments have been partially withheld pending the completion of certain milestones, satisfaction of other contractual conditions or the completion of the project. Retainage agreements vary from project to project and balances could be outstanding for several months or years depending on a number of circumstances such as contract-specific terms, project performance and other variables that may arise as the Company makes progress towards completion.  Costs and estimated earnings in excess of billings represent the excess of contract costs and profits (or contract revenue) over the amount of contract billings to date and are classified as a current asset. Costs and estimated earnings in excess of billings result when either: 1) the appropriate contract revenue amount has been recognized over time in accordance with ASC 606, but a portion of the revenue recorded cannot be billed currently due to the billing terms defined in the contract, or 2) costs are incurred related to certain claims and unapproved change orders. Claims occur when there is a dispute regarding both a change in the scope of work and the price associated with that change. Unapproved change orders occur when a change in the scope of work results in additional work being performed before the parties have agreed on the corresponding change in the contract price. The Company routinely estimates recovery related to claims and unapproved change orders as a form of variable consideration at the most likely amount it expects to receive and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Claims and unapproved change orders are billable upon the agreement and resolution between the contractual parties and after the execution of contractual amendments. Increases in claims and unapproved change orders typically result from costs being incurred against existing or new positions; decreases normally result from resolutions and subsequent billings. As discussed in Note 9, Commitments and Contingencies , the resolution of these claims and unapproved change orders may require litigation or other forms of dispute resolution proceedings. Other unbilled costs and profits are billable in accordance with the billing terms of each of the existing contractual arrangements and, as such, the timing of contract billing cycles can cause fluctuations in the balance of unbilled costs and profits. Ultimate resolution of other unbilled costs and profits typically involves incremental progress toward contractual requirements or milestones.  Capitalized contract costs primarily represent costs to fulfill a contract that (1) directly relate to an existing or anticipated contract, (2) generate or enhance resources that will be used in satisfying performance obligations in the future and (3) are expected to be recovered through the contract, and are included in other current assets. Capitalized contract costs are generally expensed to the associated contract over the period of anticipated use on the project. During the three and nine months ended September 30, 2018 , $4.0 million and $12.2 million of previously capitalized contract costs were amortized and recognized as expense on the related contracts, respectively.  Contract liabilities include amounts owed under retainage provisions and billings in excess of costs and estimated earnings. The amount as reported on the Condensed Consolidated Balance Sheets consist of the following:      As of September 30, As of January 1,  (in thousands) 2018 2018  Retainage payable $ 213,430 $ 261,820  Billings in excess of costs and estimated earnings 648,287 496,654  Total contract liabilities $ 861,717 $ 758,474 

Cash, Cash Equivalents And Re_2

Cash, Cash Equivalents And Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2018
Cash, Cash Equivalents and Restricted Cash [Abstract]
Reconciliation Of Cash, Cash Equivalents And Restricted Cash	   As of September 30, As of December 31,  (in thousands) 2018 2017  Cash and cash equivalents available for general corporate purposes $ 53,927 $ 94,713  Joint venture cash and cash equivalents 64,331 98,155  Cash and cash equivalents 118,258 192,868  Restricted cash 3,436 4,780  Total cash, cash equivalents and restricted cash $ 121,694 $ 197,648 

Earnings Per Common Share (EP_2

Earnings Per Common Share (EPS) (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Common Share (EPS) [Abstract]
Calculations of the Basic and Diluted EPS	   Three Months Ended September 30, Nine Months Ended September 30,  (in thousands, except per common share data) 2018 2017 2018 2017  Net income attributable to Tutor Perini Corporation $ 21,272 $ 23,584 $ 34,031 $ 67,444   Weighted-average common shares outstanding, basic 50,018 49,775 49,927 49,602  Effect of dilutive restricted stock units and stock options 357 812 283 1,166  Weighted-average common shares outstanding, diluted 50,375 50,587 50,210 50,768   Net income attributable to Tutor Perini Corporation per common share:  Basic $ 0.43 $ 0.47 $ 0.68 $ 1.36  Diluted $ 0.42 $ 0.47 $ 0.68 $ 1.33   Anti-dilutive securities not included above 2,107 912 2,765 752 

Financial Commitments (Tables)

Financial Commitments (Tables)	9 Months Ended
	Sep. 30, 2018
Financial Commitments [Abstract]
Long-term Debt	   As of September 30, As of December 31,  (in thousands) 2018 2017  2017 Senior Notes $ 493,319 $ 492,734  Convertible Notes 168,932 161,635  2017 Credit Facility 78,000 —  Equipment financing and mortgages 56,227 76,820  Other indebtedness 4,846 5,087  Total debt 801,324 736,276  Less: Current maturities 20,601 30,748  Long-term debt, net $ 780,723 $ 705,528 
Reconciliation Of Outstanding Debt Balance To Reported Debt Balance	   As of September 30, 2018 As of December 31, 2017  (in thousands) Outstanding Long-Term Debt Unamortized Discount and Issuance Costs Long-Term Debt, as reported Outstanding Long-Term Debt Unamortized Discount and Issuance Costs Long-Term Debt, as reported  2017 Senior Notes $ 500,000 $ (6,681) $ 493,319 $ 500,000 $ (7,266) $ 492,734  Convertible Notes 200,000 (31,068) 168,932 200,000 (38,365) 161,635 
Summary Of Interest Expense As Reported In The Condensed Consolidated Statements of Income	    Three Months Ended Nine Months Ended  September 30, September 30,  (in thousands) 2018 2017 2018 2017  Cash interest expense:  Interest on 2017 Senior Notes $ 8,594 $ 8,593 $ 25,781 $ 15,373  Interest on 2017 Credit Facility 2,596 2,035 6,300 3,526  Interest on Convertible Notes 1,437 1,438 4,312 4,313  Interest on 2010 Senior Notes — — — 6,926  Interest on 2014 Credit Facility — — — 4,455  Other interest 736 802 2,119 2,495  Cash portion of loss on extinguishment — — — 1,913  Total cash interest expense 13,363 12,868 38,512 39,001   Non-cash interest expense: (a)  Amortization of discount and debt issuance costs on Convertible Notes 2,490 2,268 7,298 6,646  Amortization of debt issuance costs on 2017 Credit Facility 360 322 1,080 603  Amortization of debt issuance costs on 2017 Senior Notes 198 185 584 326  Amortization of debt issuance costs on 2014 Credit Facility — — — 1,703  Amortization of discount and debt issuance costs on 2010 Senior Notes — — — 308  Non-cash portion of loss on extinguishment — — — 5,139  Total non-cash interest expense 3,048 2,775 8,962 14,725   Total interest expense $ 16,411 $ 15,643 $ 47,474 $ 53,726 (a) The combination of cash and non-cash interest expense produces effective interest rates that are higher than contractual rates. Accordingly, the effective interest rates for the 2017 Senior Notes and the Convertible Notes were 7.13% and 9.39% , respectively, for the nine months ended September 30, 2018.

Employee Pension Plans (Tables)

Employee Pension Plans (Tables)	9 Months Ended
	Sep. 30, 2018
Employee Pension Plans [Abstract]
Components of Net Periodic Benefit Cost	   Three Months Ended September 30, Nine Months Ended September 30,  (in thousands) 2018 2017 2018 2017  Interest cost $ 883 $ 975 $ 2,649 $ 2,925  Expected return on plan assets (1,077) (1,088) (3,231) (3,264)  Amortization of net loss 513 456 1,539 1,368  Other 213 213 639 639  Net periodic benefit cost $ 532 $ 556 $ 1,596 $ 1,668 

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Measurements [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	 As of September 30, 2018 As of December 31, 2017  Fair Value Hierarchy Fair Value Hierarchy  (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total  Cash and cash equivalents (a) $ 118,258 $ — $ — $ 118,258 $ 192,868 $ — $ — $ 192,868  Restricted cash (a) 3,436 — — 3,436 4,780 — — 4,780  Restricted investments (b) — 53,116 — 53,116 — — — —  Investments in lieu of retainage (c) 62,341 1,189 — 63,530 69,891 2,405 — 72,296  Other investments (b) — 4,611 — 4,611 — — — —  Total $ 184,035 $ 58,916 $ — $ 242,951 $ 267,539 $ 2,405 $ — $ 269,944 (a) Includes money market funds with original maturity dates of three months or less. (b) During the second quarter of 2018, the Company reclassified its restricted investments and other investments from the held-to-maturity category to the available-for-sale category as a result of a change in management’s investment strategy. At the time of the transfer, the securities had an aggregate amortized cost of $60.1 million and an immaterial aggregate unrealized loss. Restricted investments and other investments, as of September 30, 2018, consist of investments in corporate debt securities of $31.4 million and U.S. government agency securities of $26. 3 million, and are valued based on pricing models, which are determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets and are therefore classified as Level 2 Assets. As of December 31, 2017, restricted investments and other investments consisted of investments in U.S. agency securities of $26.1 million and corporate debt securities of $33.0 million. The maturities for restricted investments and other investments range from one month to five years. The amortized cost of these securities at September 30, 2018 and December 31, 2017 was not materially different from the fair value. Other investments are included in other current assets on the Condensed Consolidated Balance Sheets. As of December 31, 2017, the Company’s held-to-maturity restricted investments and other investments had an amortized cost of $59.6 million and fair value of $59.1 million. (c) Investments in lieu of retainage are included in retainage receivable and as of September 30, 2018 are comprised of money market funds of $62. 3 million and municipal bonds of $1. 2 million, the majority of which are rated A3 or better. The fair values of the money market funds are measured using quoted market prices; therefore, they are classified as Level 1 assets. The fair values of municipal bonds are measured using readily available pricing sources for comparable instruments; therefore, they are classified as Level 2 assets. As of December 31, 2017, investments in lieu of retainage consisted of money market funds of $69.9 million and municipal bonds of $2.4 million. The amortized cost of these available-for-sale securities at September 30, 2018 and December 31, 2017 was not materially different from the fair value.

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2018
Other Comprehensive Income (Loss) [Abstract]
Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)	The tax effects of the components of other comprehensive income (loss) for the three months ended September 30, 2018 and 2017 are as follows:      Three Months Ended Three Months Ended  September 30, 2018 September 30, 2017  (in thousands) Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount  Other comprehensive income (loss):  Defined benefit pension plan adjustments $ 513 $ (148) $ 365 $ 456 $ (187) $ 269  Foreign currency translation adjustments 519 (143) 376 1,232 (506) 726  Unrealized gain (loss) in fair value of investments (173) 44 (129) 21 (9) 12  Total other comprehensive income (loss) 859 (247) 612 1,709 (702) 1,007  Total other comprehensive income (loss) attributable to Tutor Perini Corporation $ 859 $ (247) $ 612 $ 1,709 $ (702) $ 1,007  The tax effects of the components of other comprehensive income (loss) for the nine months ended September 30, 2018 and 2017 are as follows:      Nine Months Ended Nine Months Ended  September 30, 2018 September 30, 2017  (in thousands) Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount Before-Tax Amount Tax (Expense) Benefit Net-of-Tax Amount  Other comprehensive income (loss):  Defined benefit pension plan adjustments $ 1,539 $ (439) $ 1,100 $ 1,368 $ (562) $ 806  Foreign currency translation adjustment (2,034) 602 (1,432) 2,242 (921) 1,321  Unrealized gain (loss) in fair value of investments (1,468) 325 (1,143) (20) 8 (12)  Total other comprehensive income (loss) (1,963) 488 (1,475) 3,590 (1,475) 2,115  Total other comprehensive income (loss) attributable to Tutor Perini Corporation $ (1,963) $ 488 $ (1,475) $ 3,590 $ (1,475) $ 2,115 
Schedule Of Changes In AOCI Balances By Component (After-Tax)	The changes in AOCI balances by component (after tax) during the three and nine months ended September 30, 2018 are as follows:      Three Months Ended September 30, 2018  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of June 30, 2018 $ (38,706) $ (5,399) $ (700) $ (44,805)  Other comprehensive income (loss) before reclassifications — 376 (145) 231  Amounts reclassified from AOCI 365 — 16 381  Total other comprehensive income (loss) 365 376 (129) 612  Balance as of September 30, 2018 $ (38,341) $ (5,023) $ (829) $ (44,193)      Nine Months Ended September 30, 2018  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of December 31, 2017 $ (39,441) $ (3,591) $ 314 $ (42,718)  Other comprehensive income (loss) before reclassifications — (1,432) (1,159) (2,591)  Amounts reclassified from AOCI 1,100 — 16 1,116  Total other comprehensive income (loss) 1,100 (1,432) (1,143) (1,475)  Balance as of September 30, 2018 $ (38,341) $ (5,023) $ (829) $ (44,193)  The changes in AOCI balance by component (after tax) for the three and nine months ended September 30, 2017 are as follows:     Three Months Ended September 30, 2017  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of June 30, 2017 $ (40,328) $ (4,269) $ 292 $ (44,305)  Other comprehensive income (loss) before reclassifications — 726 12 738  Amounts reclassified from AOCI 269 — — 269  Total other comprehensive income (loss) 269 726 12 1,007  Balance as of September 30, 2017 $ (40,059) $ (3,543) $ 304 $ (43,298)      Nine Months Ended September 30, 2017  Defined Unrealized Accumulated  Benefit Foreign Gain (Loss) in Other  Pension Currency Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as of December 31, 2016 $ (40,865) $ (4,864) $ 316 $ (45,413)  Other comprehensive income (loss) before reclassifications — 1,321 (12) 1,309  Amounts reclassified from AOCI 806 — — 806  Total other comprehensive income (loss) 806 1,321 (12) 2,115  Balance as of September 30, 2017 $ (40,059) $ (3,543) $ 304 $ (43,298)

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2018
Business Segments [Abstract]
Reportable Segments	    Reportable Segments  Specialty Consolidated  (in thousands) Civil Building Contractors Total Corporate Total  Three Months Ended September 30, 2018  Total revenue $ 479,581 $ 457,304 $ 236,157 $ 1,173,042 $ — $ 1,173,042  Elimination of intersegment revenue (48,093) (1,812) — (49,905) — (49,905)  Revenue from external customers $ 431,488 $ 455,492 $ 236,157 $ 1,123,137 $ — $ 1,123,137  Income (loss) from construction operations $ 41,282 $ 8,853 $ 11,561 $ 61,696 $ (14,390) (a) $ 47,306  Capital expenditures $ 15,364 $ 277 $ 70 $ 15,711 $ 397 $ 16,108  Depreciation and amortization (b) $ 8,031 $ 488 $ 1,081 $ 9,600 $ 2,817 $ 12,417   Three Months Ended September 30, 2017  Total revenue $ 458,487 $ 500,420 $ 310,137 $ 1,269,044 $ — $ 1,269,044  Elimination of intersegment revenue (62,667) (6,872) — (69,539) — (69,539)  Revenue from external customers $ 395,820 $ 493,548 $ 310,137 $ 1,199,505 $ — $ 1,199,505  Income (loss) from construction operations $ 38,144 $ 14,058 $ 14,575 $ 66,777 $ (17,705) (a) $ 49,072  Capital expenditures $ 1,248 $ 36 $ 81 $ 1,365 $ 164 $ 1,529  Depreciation and amortization (b) $ 5,213 $ 502 $ 1,166 $ 6,881 $ 2,824 $ 9,705 (a) Consists primarily of corporate general and administrative expenses. (b) Depreciation and amortization is included in income from construction operations.       Reportable Segments  Specialty Consolidated  (in thousands) Civil Building Contractors Total Corporate Total  Nine Months Ended September 30, 2018  Total revenue $ 1,266,595 $ 1,395,896 $ 781,591 $ 3,444,082 $ — $ 3,444,082  Elimination of intersegment revenue (169,520) (3,184) — (172,704) — (172,704)  Revenue from external customers $ 1,097,075 $ 1,392,712 $ 781,591 $ 3,271,378 $ — $ 3,271,378  Income (loss) from construction operations (a) $ 93,560 $ 27,814 $ 26,250 $ 147,624 $ (46,428) (b) $ 101,196  Capital expenditures $ 61,912 $ 1,147 $ 704 $ 63,763 $ 648 $ 64,411  Depreciation and amortization (c) $ 20,356 $ 1,458 $ 3,299 $ 25,113 $ 8,468 $ 33,581   Nine Months Ended September 30, 2017  Total revenue $ 1,363,850 $ 1,520,356 $ 907,690 $ 3,791,896 $ — $ 3,791,896  Elimination of intersegment revenue (190,873) (36,883) — (227,756) — (227,756)  Revenue from external customers $ 1,172,977 $ 1,483,473 $ 907,690 $ 3,564,140 $ — $ 3,564,140  Income (loss) from construction operations $ 128,176 $ 25,035 $ 15,330 $ 168,541 $ (48,407) (b) $ 120,134  Capital expenditures $ 8,665 $ 184 $ 374 $ 9,223 $ 489 $ 9,712  Depreciation and amortization (c) $ 26,767 $ 1,533 $ 3,551 $ 31,851 $ 8,612 $ 40,463 (a) During the nine months ended September 30, 2018, the Company recorded a charge of $17.8 million in income from construction operations (an after-tax impact of $ 12.8 million, or $ 0.25 per diluted share), which was primarily non-cash, as a result of the unexpected outcome of an arbitration decision related to a subcontract back charge dispute on a Civil segment project in New York that was completed in 2013. (b) Consists primarily of corporate general and administrative expenses. Depreciation and amortization is included in income from construction operations.
Reconciliation of Segment Results to Consolidated Income Before Income Taxes	   Three Months Ended September 30, Nine Months Ended September 30,  (in thousands) 2018 2017 2018 2017  Income from construction operations $ 47,306 $ 49,072 $ 101,196 $ 120,134  Other income, net 1,909 967 3,739 42,373  Interest expense (16,411) (15,643) (47,474) (53,726)  Income before income taxes $ 32,804 $ 34,396 $ 57,461 $ 108,781 
Schedule of Assets by Segment	    As of As of  (in thousands) September 30, 2018 December 31, 2017  Civil $ 2,597,653 $ 2,452,108  Building 936,365 909,207  Specialty Contractors 760,017 767,807  Corporate and other (a) 131,133 135,001  Total assets $ 4,425,168 $ 4,264,123 (a) Consists principally of cash, equipment, tax-related assets and insurance-related assets, offset by the elimination of assets related to intersegment revenue.

Recent Accounting Pronounceme_4

Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Increase of net cash used in investing activities	$ (58,488)	$ (56,929)
Accounting Standards Update 2016-18 [Member]
Increase of net cash used in investing activities		$ 33,100

Recent Accounting Pronounceme_5

Recent Accounting Pronouncements (Schedule of the Impact for the Adoption of ASU 2014-09) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
ASSETS
Accounts receivable	$ 1,325,465		$ 1,325,465			$ 1,265,717
Retainage receivable	492,937		492,937		$ 535,939	535,939
Costs and estimated earnings in excess of billings	1,085,651		1,085,651		932,758	932,758
Other current assets	130,023		130,023			89,316
LIABILITIES
Accounts payable	611,100		611,100			699,971
Retainage payable	213,430		213,430		261,820	261,820
Billings in excess of costs and estimated earnings	648,287		648,287		496,654	456,869
Accrued expenses and other current liabilities ($46,164 and $0 related to VIEs)	162,102		162,102			132,438
Deferred income taxes	106,636		106,636			108,504
EQUITY
Retained earnings	652,276		652,276			622,007
Noncontrolling interests	(23,376)		(23,376)			(8,495)
STATEMENT OF OPERATIONS
REVENUE	1,123,137	$ 1,199,505	3,271,378	$ 3,564,140
COST OF OPERATIONS	(1,012,013)	(1,081,254)	(2,974,546)	(3,240,332)
GROSS PROFIT	111,124	118,251	296,832	323,808
General and administrative expenses	(63,818)	(69,179)	(195,636)	(203,674)
INCOME FROM CONSTRUCTION OPERATIONS	47,306	49,072	101,196	120,134
Other income, net	1,909	967	3,739	42,373
Interest expense	(16,411)	(15,643)	(47,474)	(53,726)
INCOME BEFORE INCOME TAXES	32,804	34,396	57,461	108,781
Provision for income taxes	(7,368)	(9,096)	(15,071)	(37,084)
NET INCOME	25,436	25,300	42,390	71,697
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	4,164	1,716	8,359	4,253
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	21,272	$ 23,584	34,031	$ 67,444
Accounting Standards Update 606 [Member]
ASSETS
Accounts receivable	1,325,465		1,325,465		1,265,717
Retainage receivable	492,937		492,937		535,939
Costs and estimated earnings in excess of billings	1,085,651		1,085,651
Other current assets	130,023		130,023		122,089
LIABILITIES
Accounts payable	611,100		611,100		699,971
Retainage payable	213,430		213,430		261,820
Billings in excess of costs and estimated earnings	648,287		648,287		496,654
Accrued expenses and other current liabilities ($46,164 and $0 related to VIEs)	162,102		162,102
Deferred income taxes	106,636		106,636		106,967
EQUITY
Retained earnings	652,276		652,276		618,245
Noncontrolling interests	(23,376)		(23,376)		(10,209)
STATEMENT OF OPERATIONS
REVENUE	1,123,137		3,271,378
COST OF OPERATIONS	(1,012,013)		(2,974,546)
GROSS PROFIT	111,124		296,832
General and administrative expenses	(63,818)		(195,636)
INCOME FROM CONSTRUCTION OPERATIONS	47,306		101,196
Other income, net	1,909		3,739
Interest expense	(16,411)		(47,474)
INCOME BEFORE INCOME TAXES	32,804		57,461
Provision for income taxes	(7,368)		(15,071)
NET INCOME	25,436		42,390
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	4,164		8,359
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	21,272		34,031
Without Adoption Of ASU 606 [Member]
ASSETS
Accounts receivable	1,816,399		1,816,399			1,801,656
Costs and estimated earnings in excess of billings	1,089,452		1,089,452
Other current assets	89,875		89,875			89,316
LIABILITIES
Accounts payable	824,530		824,530			961,791
Billings in excess of costs and estimated earnings	601,913		601,913			456,869
Accrued expenses and other current liabilities ($46,164 and $0 related to VIEs)	162,727		162,727
Deferred income taxes	107,835		107,835			108,504
EQUITY
Retained earnings	656,742		656,742			622,007
Noncontrolling interests	(21,643)		(21,643)			$ (8,495)
STATEMENT OF OPERATIONS
REVENUE	1,122,571		3,279,764
COST OF OPERATIONS	(1,011,808)		(2,981,921)
GROSS PROFIT	110,763		297,843
General and administrative expenses	(63,818)		(195,636)
INCOME FROM CONSTRUCTION OPERATIONS	46,945		102,207
Other income, net	1,909		3,739
Interest expense	(16,411)		(47,474)
INCOME BEFORE INCOME TAXES	32,443		58,472
Provision for income taxes	(7,303)		(15,358)
NET INCOME	25,140		43,114
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	4,024		8,379
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	21,116		34,735
Adjustments Due To ASU 606 [Member] | Accounting Standards Update 606 [Member]
ASSETS
Accounts receivable	(490,934)		(490,934)		(535,939)
Retainage receivable	492,937		492,937		535,939
Costs and estimated earnings in excess of billings	(3,801)		(3,801)
Other current assets	40,148		40,148		32,773
LIABILITIES
Accounts payable	(213,430)		(213,430)		(261,820)
Retainage payable	213,430		213,430		261,820
Billings in excess of costs and estimated earnings	46,374		46,374		39,785
Accrued expenses and other current liabilities ($46,164 and $0 related to VIEs)	(625)		(625)
Deferred income taxes	(1,199)		(1,199)		(1,537)
EQUITY
Retained earnings	(4,466)		(4,466)		(3,762)
Noncontrolling interests	(1,733)		(1,733)		$ (1,714)
STATEMENT OF OPERATIONS
REVENUE	566		(8,386)
COST OF OPERATIONS	(205)		7,375
GROSS PROFIT	361		(1,011)
INCOME FROM CONSTRUCTION OPERATIONS	361		(1,011)
INCOME BEFORE INCOME TAXES	361		(1,011)
Provision for income taxes	(65)		287
NET INCOME	296		(724)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	140		(20)
NET INCOME ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ 156		$ (704)

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) $ in Billions	9 Months Ended
	Sep. 30, 2018USD ($)
Civil [Member]
Revenue, Remaining Performance Obligation, Amount	$ 4.2
Civil [Member] | Minimum [Member[
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range	3 years
Civil [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range	5 years
Building [Member]
Revenue, Remaining Performance Obligation, Amount	$ 2.1
Specialty Contractors [Member]
Revenue, Remaining Performance Obligation, Amount	$ 1.7
Building And Specialty Contractors [Member] | Minimum [Member[
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range	1 year
Building And Specialty Contractors [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range	3 years

Revenue (Disaggregation Of Reve

Revenue (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Contracts Revenue	$ 1,123,137	$ 1,199,505	$ 3,271,378	$ 3,564,140
State And Local Agencies [Member]
Contracts Revenue	618,357		1,660,072
Federal Agencies [Member]
Contracts Revenue	91,892		262,805
Private Owners [Member]
Contracts Revenue	412,888		1,348,501
Civil [Member]
Contracts Revenue	431,488	395,820	1,097,075	1,172,977
Civil [Member] | State And Local Agencies [Member]
Contracts Revenue	341,067		894,613
Civil [Member] | Federal Agencies [Member]
Contracts Revenue	26,944		67,571
Civil [Member] | Private Owners [Member]
Contracts Revenue	63,477		134,891
Civil [Member] | Mass Transit [Member]
Contracts Revenue	177,619		485,841
Civil [Member] | Bridges [Member]
Contracts Revenue	128,240		311,979
Civil [Member] | Highways [Member]
Contracts Revenue	46,553		129,619
Civil [Member] | Tunneling [Member]
Contracts Revenue	33,377		66,009
Civil [Member] | Other [Member]
Contracts Revenue	45,699		103,627
Building [Member]
Contracts Revenue	455,492	493,548	1,392,712	1,483,473
Building [Member] | State And Local Agencies [Member]
Contracts Revenue	177,377		452,918
Building [Member] | Federal Agencies [Member]
Contracts Revenue	52,890		149,464
Building [Member] | Private Owners [Member]
Contracts Revenue	225,225		790,330
Building [Member] | Health Care Facilities [Member]
Contracts Revenue	127,219		320,416
Building [Member] | Commercial And Industrial Facilities [Member]
Contracts Revenue	57,505		290,571
Building [Member] | Hospitality And Gaming [Member]
Contracts Revenue	65,744		226,999
Building [Member] | Municipal And Government [Member]
Contracts Revenue	67,003		187,984
Building [Member] | Mixed Use [Member]
Contracts Revenue	40,758		121,348
Building [Member] | Education Facilities [Member]
Contracts Revenue	43,405		108,763
Building [Member] | Other [Member]
Contracts Revenue	53,858		136,631
Specialty Contractors [Member]
Contracts Revenue	236,157	$ 310,137	781,591	$ 907,690
Specialty Contractors [Member] | State And Local Agencies [Member]
Contracts Revenue	99,913		312,541
Specialty Contractors [Member] | Federal Agencies [Member]
Contracts Revenue	12,058		45,770
Specialty Contractors [Member] | Private Owners [Member]
Contracts Revenue	124,186		423,280
Specialty Contractors [Member] | Mass Transit [Member]
Contracts Revenue	63,457		216,808
Specialty Contractors [Member] | Health Care Facilities [Member]
Contracts Revenue	12,873		43,861
Specialty Contractors [Member] | Commercial And Industrial Facilities [Member]
Contracts Revenue	48,601		136,892
Specialty Contractors [Member] | Mixed Use [Member]
Contracts Revenue	37,587		137,420
Specialty Contractors [Member] | Education Facilities [Member]
Contracts Revenue	26,024		77,626
Specialty Contractors [Member] | Transportation [Member]
Contracts Revenue	17,150		73,154
Specialty Contractors [Member] | Condominiums [Member]
Contracts Revenue	18,254		64,104
Specialty Contractors [Member] | Other [Member]
Contracts Revenue	$ 12,211		$ 31,726

Revenue (Schedule Of Revenue By

Revenue (Schedule Of Revenue By Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Contracts Revenue	$ 1,123,137	$ 1,199,505	$ 3,271,378	$ 3,564,140
Fixed Price [Member]
Contracts Revenue	558,575		1,659,982
Guaranteed Maximum Price [Member]
Contracts Revenue	290,814		864,499
Unit Price [Member]
Contracts Revenue	159,794		383,473
Cost Plus Fee And Other [Member]
Contracts Revenue	113,954		363,424
Civil [Member]
Contracts Revenue	431,488	395,820	1,097,075	1,172,977
Civil [Member] | Fixed Price [Member]
Contracts Revenue	272,996		716,826
Civil [Member] | Guaranteed Maximum Price [Member]
Contracts Revenue	3,025		11,200
Civil [Member] | Unit Price [Member]
Contracts Revenue	141,917		332,118
Civil [Member] | Cost Plus Fee And Other [Member]
Contracts Revenue	13,550		36,931
Building [Member]
Contracts Revenue	455,492	493,548	1,392,712	1,483,473
Building [Member] | Fixed Price [Member]
Contracts Revenue	91,972		267,630
Building [Member] | Guaranteed Maximum Price [Member]
Contracts Revenue	269,069		801,537
Building [Member] | Unit Price [Member]
Contracts Revenue	9,938		29,526
Building [Member] | Cost Plus Fee And Other [Member]
Contracts Revenue	84,513		294,019
Specialty Contractors [Member]
Contracts Revenue	236,157	$ 310,137	781,591	$ 907,690
Specialty Contractors [Member] | Fixed Price [Member]
Contracts Revenue	193,607		675,526
Specialty Contractors [Member] | Guaranteed Maximum Price [Member]
Contracts Revenue	18,720		51,762
Specialty Contractors [Member] | Unit Price [Member]
Contracts Revenue	7,939		21,829
Specialty Contractors [Member] | Cost Plus Fee And Other [Member]
Contracts Revenue	$ 15,891		$ 32,474

Contract Assets And Liabiliti_3

Contract Assets And Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Contract Assets and Liabilities [Abstract]
Capitalized contract costs were amortized and recognized as expense	$ 4	$ 12.2
Contract with Customer, Liability, Revenue Recognized	$ 251.4	$ 341.2

Contract Assets And Liabiliti_4

Contract Assets And Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract Assets and Liabilities [Abstract]
Retainage receivable	$ 492,937	$ 535,939	$ 535,939
Claims	672,858	549,849
Unapproved change orders	349,286	296,591
Other unbilled costs and profits	63,507	86,318
Total costs and estimated earnings in excess of billings	1,085,651	932,758	$ 932,758
Capitalized contract costs	41,221	32,773
Total contract assets	$ 1,619,809	$ 1,501,470

Contract Assets And Liabiliti_5

Contract Assets And Liabilities (Schedule Of Contract Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract Assets and Liabilities [Abstract]
Retainage payable	$ 213,430	$ 261,820	$ 261,820
Billings in excess of costs and estimated earnings	648,287	496,654	$ 456,869
Total contract liabilities	$ 861,717	$ 758,474

Cash, Cash Equivalents And Re_3

Cash, Cash Equivalents And Restricted Cash (Reconciliation Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 118,258	$ 192,868
Restricted cash	3,436	4,780
Total cash, cash equivalents and restricted cash	121,694	197,648	$ 239,302	$ 196,607
Tutor Perini Corporation [Member]
Cash and cash equivalents	53,927	94,713
Joint Venture [Member]
Cash and cash equivalents	$ 64,331	$ 98,155

Earnings Per Common Share (EP_3

Earnings Per Common Share (EPS) (Calculations of the Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Common Share (EPS) [Abstract]
Net income attributable to Tutor Perini Corporation	$ 21,272	$ 23,584	$ 34,031	$ 67,444
Weighted-average common shares outstanding, basic	50,018	49,775	49,927	49,602
Effect of dilutive restricted stock units and stock options	357	812	283	1,166
Weighted-average common shares outstanding, diluted	50,375	50,587	50,210	50,768
Net income attributable to Tutor Perini Corporation per common share: Basic	$ 0.43	$ 0.47	$ 0.68	$ 1.36
Net income attributable to Tutor Perini Corporation per common share: Diluted	$ 0.42	$ 0.47	$ 0.68	$ 1.33
Anti-dilutive securities not included above	2,107	912	2,765	752

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Effective income tax rate	22.50%	26.40%	26.20%	34.10%
Federal statutory income tax rate	21.00%		21.00%		35.00%

Financial Commitments (Narrativ

Financial Commitments (Narrative) (Details)	Apr. 20, 2017USD ($)	Sep. 30, 2018USD ($)d / item$ / sharesshares	Dec. 31, 2017USD ($)
Senior Notes [Member] | 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Effective interest rates		7.13%
Senior Notes [Member] | 2010 Senior Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Interest rate	7.625%
Maturity date	Nov. 1, 2018
Senior Notes [Member] | Private Placement [Member] | 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Face amount		$ 500,000,000
Interest rate		6.875%
Redemption price, change of control triggering event (as a percent)		101.00%
Senior Notes [Member] | Circumstance One [Member] | Private Placement [Member] | 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price		100.00%
Senior Notes [Member] | Circumstance Two [Member] | Private Placement [Member] | 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price		106.875%
Percentage of notes that can be redeemed		40.00%
Convertible Notes [Member]
Debt Instrument [Line Items]
Face amount		$ 200,000,000
Interest rate		2.875%
Maturity date		Jun. 15, 2021
Conversion price | $ / shares		$ 30.25
Effective interest rates		9.39%
Convertible Notes [Member] | Circumstance One [Member]
Debt Instrument [Line Items]
Business day period after consecutive trading day period		5 days
Consecutive trading day period | d / item		10
Conversion price, principal amount		$ 1,000
Percentage of conversion price		98.00%
Convertible Notes [Member] | Circumstance Two [Member]
Debt Instrument [Line Items]
Consecutive trading day period | d / item		30
Percentage of conversion price		130.00%
Business day period within consecutive trading day period | d / item		20
Conversion stock price trigger | $ / shares		$ 39.32
Conversion price, shares | shares		33.0579
Credit Facility [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 350,000,000
Available borrowing capacity		272,000,000
Additional borrowing		$ 150,000,000
Line of Credit Facility, Expiration Date		Apr. 20, 2022
Applicable margin and letter of credit fees will be increased percentage per annum.		2.00%
Weighted-average annual interest rate on borrowings		4.64%
Fixed charge coverage ratio		1.25
Debt issuance costs		$ 5,100,000	$ 6,200,000
Credit Facility [Member] | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Line of Credit Facility, Expiration Date	May 1, 2018
Credit Facility [Member] | Letters Of Credit [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		150,000,000
Credit Facility [Member] | Swingline Loans [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount		$ 10,000,000
Credit Facility [Member] | Term Loan [Member] | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount	$ 250,000,000
Credit Facility [Member] | Minimum [Member[ | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio		3.25
Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio		4
LIBOR [Member] | Credit Facility [Member] | Minimum [Member[ | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		1.50%
LIBOR [Member] | Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		3.00%
Base Rate [Member] | Credit Facility [Member] | Circumstance Three [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		1.00%
Base Rate [Member] | Credit Facility [Member] | Circumstance Four [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate		0.00%
Base Rate [Member] | Credit Facility [Member] | Minimum [Member[ | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		0.50%
Base Rate [Member] | Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		2.00%
Federal Funds Rate [Member] | Credit Facility [Member] | Circumstance Two [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		0.50%

Financial Commitments (Long-Ter

Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 801,324	$ 736,276
Less: Current maturities	20,601	30,748
Long-term debt, net	780,723	705,528
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt	168,932	161,635
Equipment Financing And Mortgages [Member]
Debt Instrument [Line Items]
Total debt	56,227	76,820
Other Indebtedness [Member]
Debt Instrument [Line Items]
Total debt	4,846	5,087
2017 Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	493,319	$ 492,734
2017 Credit Facility [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 78,000

Financial Commitments (Reconcil

Financial Commitments (Reconciliation Of Outstanding Debt Balance To Reported Debt Balance) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized Discount and Issuance Costs	$ (37,749)	$ (45,631)
Total debt	801,324	736,276
Convertible Notes [Member]
Debt Instrument [Line Items]
Outstanding Long-Term Debt	200,000	200,000
Unamortized Discount and Issuance Costs	(31,068)	(38,365)
Total debt	168,932	161,635
2017 Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Outstanding Long-Term Debt	500,000	500,000
Unamortized Discount and Issuance Costs	(6,681)	(7,266)
Total debt	$ 493,319	$ 492,734

Financial Commitments (Summary

Financial Commitments (Summary Of Interest Expense As Reported In The Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other interest	$ 736	$ 802	$ 2,119	$ 2,495
Cash portion of loss on extinguishment				1,913
Non-cash portion of loss on extinguishment				5,139
Total cash interest expense	13,363	12,868	38,512	39,001
Total non-cash interest expense	3,048	2,775	8,962	14,725
Total interest expense	16,411	15,643	47,474	53,726
Convertible Notes [Member]
Interest on debt	1,437	1,438	4,312	4,313
Total non-cash interest expense	$ 2,490	2,268	$ 7,298	6,646
Effective interest rates	9.39%		9.39%
2017 Senior Notes [Member] | Senior Notes [Member]
Interest on debt	$ 8,594	8,593	$ 25,781	15,373
Total non-cash interest expense	$ 198	185	$ 584	326
Effective interest rates	7.13%		7.13%
2017 Credit Facility [Member] | Credit Facility [Member]
Interest on debt	$ 2,596	2,035	$ 6,300	3,526
Total non-cash interest expense	$ 360	$ 322	$ 1,080	603
2010 Senior Notes [Member] | Senior Notes [Member]
Interest on debt				6,926
Total non-cash interest expense				308
2014 Credit Facility [Member] | Credit Facility [Member]
Interest on debt				4,455
Total non-cash interest expense				$ 1,703

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Details) $ in Millions

Mar. 20, 2014USD ($)

Mar. 31, 2012USD ($)

Dec. 31, 2017USD ($)

Dec. 31, 2009USD ($)room

Sep. 30, 2018USD ($)

May 17, 2017USD ($)

Jul. 31, 2014USD ($)

May 31, 2012USD ($)

Sep. 30, 2011USD ($)

Jul. 31, 2010USD ($)

May 31, 2010USD ($)

Jun. 30, 2009USD ($)

Feb. 28, 2006USD ($)

Long Island Expressway/Cross Island Parkway Matter [Member]

Loss Contingencies [Line Items]

Estimated value of project completed in Feb. 2006

$ 130

Value of claim filed

$ 50.7

Amount receivable as per final agreement

$ 0.5

Value of counterclaim filed

$ 151

Fontainebleau Matter [Member]

Loss Contingencies [Line Items]

Number of rooms in hotel/casino complex | room

3,800

Amount of court order in favor of plaintiff

$ 45

Total outstanding liens on property, including subcontractors' liens

$ 44

Amount set aside from approved sale for distribution to satisfy creditor claims

$ 125

Estimated sustainable lien amount

$ 350

Westgate Planet Hollywood Matter [Member]

Loss Contingencies [Line Items]

Settlement receipt

$ 16

Total awards

$ 19.7

Damages awarded which were anticipated to be paid including interest

$ 3.1

Value of cross complaint filed

$ 51

Value of counterclaim filed

45

Total outstanding liens on property, including subcontractors' liens

23.2

Value of mechanic's lien release bond

$ 22.3

$ 22.3

Value of supersedeas bond

1.7

Total value of security

$ 24

Total value of security, interest and fees

$ 4

Minimum [Member[ | Westgate Planet Hollywood Matter [Member]

Loss Contingencies [Line Items]

Total value of security

$ 20

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-Based Compensation [Line Items]
Number of shares available for grant	880,465		880,465
Share-based compensation expense	$ 5,700,000	$ 5,600,000	$ 17,779,000	$ 16,057,000
Unamortized share-based compensation expense	$ 30,900,000		$ 30,900,000
Weighted average period over which unrecognized compensation cost is expected to be recognized			2 years 1 month 6 days
Restricted Stock Units [Member]
Share-Based Compensation [Line Items]
Units granted			614,000	1,055,000
Weighted-average per share prices			$ 25.19	$ 30.03
Stock Options [Member]
Share-Based Compensation [Line Items]
Stock options awarded			579,000	530,000
Weighted-average exercise prices			$ 23.99	$ 24.64
Weighted average grant date fair value			$ 11.45	$ 13.11
Expected life			5 years 1 month 6 days
Expected volatility			42.31%
Risk-free rate			2.57%
Quarterly dividends			$ 0
Unrestricted Stock Units [Member]
Share-Based Compensation [Line Items]
Units granted			115,420	99,155
Weighted-average per share prices			$ 21.26	$ 26.26

Employee Pension Plans (Compone

Employee Pension Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Summary of net periodic benefit cost
Interest cost	$ 883	$ 975	$ 2,649	$ 2,925
Expected return on plan assets	(1,077)	(1,088)	(3,231)	(3,264)
Amortization of net loss	513	456	1,539	1,368
Other	213	213	639	639
Net periodic benefit cost	532	$ 556	1,596	1,668
Company contribution			2,100	$ 2,000
Expected contributions remainder of current fiscal year	$ 700		$ 700

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Fair value assets and liabilities measured on recurring basis [Line Items]
Transfers between Levels 1 and 2, description	The Company did not have material transfers between Levels 1 and 2 during the nine months ended September 30, 2018 or 2017.
Transfers between Levels 1 and 2, amount	$ 0		$ 0
Convertible Notes [Member]
Long-term Debt
Long-term debt, fair value	202,400,000	$ 222,200,000
2017 Senior Notes [Member] | Senior Notes [Member]
Long-term Debt
Long-term debt, fair value	$ 517,500,000	$ 537,500,000

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Assets:
Restricted cash	$ 3,436	$ 4,780
Restricted and other investments, amortized cost	60,100
Amortized cost of investments held to maturity		59,600
Fair value of investments held to maturity		59,100
Municipal Bonds [Member]
Assets:
Investments in lieu of retainage	1,200	2,400
Money Market Funds [Member]
Assets:
Investments in lieu of retainage	62,300	69,900
US Government Agencies Debt Securities [Member]
Assets:
Restricted and other investments	26,300	26,100
Corporate Debt Securities [Member]
Assets:
Restricted and other investments	31,400	33,000
Fair Value Measured On A Recurring Basis [Member]
Assets:
Cash and cash equivalents	118,258	192,868
Restricted cash	3,436	4,780
Restricted investments	53,116
Investments in lieu of retainage	63,530	72,296
Other investments	4,611
Total assets	242,951	269,944
Fair Value Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Cash and cash equivalents	118,258	192,868
Restricted cash	3,436	4,780
Investments in lieu of retainage	62,341	69,891
Total assets	184,035	267,539
Fair Value Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Restricted investments	53,116
Investments in lieu of retainage	1,189	2,405
Other investments	4,611
Total assets	$ 58,916	$ 2,405
Minimum [Member[
Assets:
Restricted And other investments, term	1 month
Maximum [Member]
Assets:
Restricted And other investments, term	5 years

Variable Interest Entities (V_2

Variable Interest Entities (VIE) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Assets, Current	$ 3,208,886		$ 3,208,886		$ 3,074,392
Liabilities, Current	1,655,520		1,655,520		1,581,846
REVENUE	1,123,137	$ 1,199,505	3,271,378	$ 3,564,140
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current	172,800		172,800		95,500
Assets, Noncurrent	47,600		47,600		11,600
Liabilities, Current	320,100		$ 320,100		140,700
Parsons Corporation (“Parsons”) [Member] | Newark Airport Terminal One Design-Build Project [Member]
Ownership percentage in joint venture			80.00%
Variable interest entity's ownership percentage in joint venture			20.00%
Parsons Corporation (“Parsons”) [Member] | Newark Airport Terminal One Design-Build Project [Member] | Plan [Member]
REVENUE			$ 1,400,000
O&G [Member] | Purple Line Segment 2 Expansion Project [Member]
Ownership percentage in joint venture			75.00%
Related party's ownership percentage in joint venture			25.00%
O&G [Member] | Purple Line Segment 2 Expansion Project [Member] | Plan [Member]
REVENUE			$ 1,400,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Assets, Current	8,000		8,000		800
Liabilities, Current	$ 7,800		$ 7,800		$ 800

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 513	$ 456	$ 1,539	$ 1,368
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(148)	(187)	(439)	(562)
Defined benefit pension plan adjustments, Net-of-Tax Amount	365	269	1,100	806
Foreign currency translation adjustments, Before-Tax Amount	519	1,232	(2,034)	2,242
Foreign currency translation adjustments, Tax (Expense) Benefit	(143)	(506)	602	(921)
Foreign currency translation adjustments, Net-of-Tax Amount	376	726	(1,432)	1,321
Unrealized (loss) gain in fair value of investments, Before-Tax Amount	(173)	21	(1,468)	(20)
Unrealized (loss) gain in fair value of investments, Tax (Expense) Benefit	44	(9)	325	8
Unrealized (loss) gain in fair value of investments, Net-of-Tax Amount	(129)	12	(1,143)	(12)
Total other comprehensive income (loss), Before-Tax Amount	859	1,709	(1,963)	3,590
Total other comprehensive income (loss), Tax (Expense) Benefit	(247)	(702)	488	(1,475)
Total other comprehensive income (loss), Net-of-Tax Amount	612	1,007	(1,475)	2,115
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	859	1,709	(1,963)	3,590
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	(247)	(702)	488	(1,475)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ 612	$ 1,007	$ (1,475)	$ 2,115

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) (Schedule Of Changes In AOCI Balances By Component (After-Tax)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period			$ 1,713,275
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ 612	$ 1,007	(1,475)	$ 2,115
Balance at the end of the period	1,756,748		1,756,748
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	(38,706)	(40,328)	(39,441)	(40,865)
Amounts reclassified from AOCI	365	269	1,100	806
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	365	269	1,100	806
Balance at the end of the period	(38,341)	(40,059)	(38,341)	(40,059)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	(5,399)	(4,269)	(3,591)	(4,864)
Other comprehensive loss before reclassifications	376	726	(1,432)	1,321
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	376	726	(1,432)	1,321
Balance at the end of the period	(5,023)	(3,543)	(5,023)	(3,543)
Unrealized Gain (Loss) in Fair Value of Investments, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	(700)	292	314	316
Other comprehensive loss before reclassifications	(145)	12	(1,159)	(12)
Amounts reclassified from AOCI	16		16
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(129)	12	(1,143)	(12)
Balance at the end of the period	(829)	304	(829)	304
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	(44,805)	(44,305)	(42,718)	(45,413)
Other comprehensive loss before reclassifications	231	738	(2,591)	1,309
Amounts reclassified from AOCI	381	269	1,116	806
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	612	1,007	(1,475)	2,115
Balance at the end of the period	$ (44,193)	$ (43,298)	$ (44,193)	$ (43,298)

Business Segments (Narrative) (

Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)$ / shares	Sep. 30, 2017USD ($)$ / shares	Sep. 30, 2018USD ($)segment$ / shares	Sep. 30, 2017USD ($)$ / shares
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Income from construction operations	$ 47,306	$ 49,072	$ 101,196	$ 120,134
After-tax impact	$ 25,436	$ 25,300	$ 42,390	$ 71,697
DILUTED EARNINGS PER COMMON SHARE | $ / shares	$ 0.42	$ 0.47	$ 0.68	$ 1.33
Building [Member]
Segment Reporting Information [Line Items]
Income from construction operations	$ 8,853	$ 14,058	$ 27,814	$ 25,035
Civil [Member]
Segment Reporting Information [Line Items]
Income from construction operations	41,282	38,144	93,560	128,176
Civil [Member] | Scenario Unfavorable Adjustment [Member]
Segment Reporting Information [Line Items]
Income from construction operations			17,800
After-tax impact			$ 12,800
DILUTED EARNINGS PER COMMON SHARE | $ / shares			$ 0.25
Specialty Contractors [Member]
Segment Reporting Information [Line Items]
Income from construction operations	11,561	14,575	$ 26,250	15,330
Corporate [Member]
Segment Reporting Information [Line Items]
Income from construction operations	$ (14,390)	$ (17,705)	$ (46,428)	$ (48,407)

Business Segments (Reportable S

Business Segments (Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Segments [Line items]
Revenue	$ 1,123,137	$ 1,199,505	$ 3,271,378	$ 3,564,140
INCOME FROM CONSTRUCTION OPERATIONS	47,306	49,072	101,196	120,134
Capital expenditures	16,108	1,529	64,411	9,712
Depreciation and amortization	12,417	9,705	33,581	40,463
External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	1,173,042	1,269,044	3,444,082	3,791,896
Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(49,905)	(69,539)	(172,704)	(227,756)
Reportable Segments [Member]
Business Segments [Line items]
Revenue	1,123,137	1,199,505	3,271,378	3,564,140
INCOME FROM CONSTRUCTION OPERATIONS	61,696	66,777	147,624	168,541
Capital expenditures	15,711	1,365	63,763	9,223
Depreciation and amortization	9,600	6,881	25,113	31,851
Reportable Segments [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	1,173,042	1,269,044	3,444,082	3,791,896
Reportable Segments [Member] | Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(49,905)	(69,539)	(172,704)	(227,756)
Civil [Member]
Business Segments [Line items]
Revenue	431,488	395,820	1,097,075	1,172,977
INCOME FROM CONSTRUCTION OPERATIONS	41,282	38,144	93,560	128,176
Capital expenditures	15,364	1,248	61,912	8,665
Depreciation and amortization	8,031	5,213	20,356	26,767
Civil [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	479,581	458,487	1,266,595	1,363,850
Civil [Member] | Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(48,093)	(62,667)	(169,520)	(190,873)
Building [Member]
Business Segments [Line items]
Revenue	455,492	493,548	1,392,712	1,483,473
INCOME FROM CONSTRUCTION OPERATIONS	8,853	14,058	27,814	25,035
Capital expenditures	277	36	1,147	184
Depreciation and amortization	488	502	1,458	1,533
Building [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	457,304	500,420	1,395,896	1,520,356
Building [Member] | Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(1,812)	(6,872)	(3,184)	(36,883)
Specialty Contractors [Member]
Business Segments [Line items]
Revenue	236,157	310,137	781,591	907,690
INCOME FROM CONSTRUCTION OPERATIONS	11,561	14,575	26,250	15,330
Capital expenditures	70	81	704	374
Depreciation and amortization	1,081	1,166	3,299	3,551
Specialty Contractors [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	236,157	310,137	781,591	907,690
Corporate [Member]
Business Segments [Line items]
INCOME FROM CONSTRUCTION OPERATIONS	(14,390)	(17,705)	(46,428)	(48,407)
Capital expenditures	397	164	648	489
Depreciation and amortization	$ 2,817	$ 2,824	$ 8,468	$ 8,612

Business Segments (Reconciliati

Business Segments (Reconciliation of Segment Results to Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Segments [Abstract]
Income (loss) from construction operations	$ 47,306	$ 49,072	$ 101,196	$ 120,134
Other income, net	1,909	967	3,739	42,373
Interest expense	(16,411)	(15,643)	(47,474)	(53,726)
INCOME BEFORE INCOME TAXES	$ 32,804	$ 34,396	$ 57,461	$ 108,781

Business Segments (Schedule of

Business Segments (Schedule of Assets by Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Reportable segment information
Total Assets	$ 4,425,168	$ 4,264,123
Civil [Member]
Reportable segment information
Total Assets	2,597,653	2,452,108
Building [Member]
Reportable segment information
Total Assets	936,365	909,207
Specialty Contractors [Member]
Reportable segment information
Total Assets	760,017	767,807
Corporate and Other [Member]
Reportable segment information
Total Assets	$ 131,133	$ 135,001

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details) - Purple Line Segment 2 Expansion Project [Member] - O&G [Member]	9 Months Ended
	Sep. 30, 2018agreement
Related Party Transaction, Due from (to) Related Party [Abstract]
Number of joint ventures	1
Ownership percentage in joint venture	75.00%
Related party's ownership percentage in joint venture	25.00%