Tutor Perini (TPC) 10-Q 9 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 03, 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	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		49,913,003
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	tpc

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
REVENUE	$ 1,028,156	$ 1,117,361
COST OF OPERATIONS	(961,088)	(1,014,641)
GROSS PROFIT	67,068	102,720
General and administrative expenses	(67,993)	(65,703)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	(925)	37,017
Other income, net	780	417
Interest expense	(15,065)	(15,564)
INCOME (LOSS) BEFORE INCOME TAXES	(15,210)	21,870
Income tax benefit (provision)	4,268	(8,106)
NET INCOME (LOSS)	(10,942)	13,764
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1,182
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ (12,124)	$ 13,764
BASIC EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	$ (0.24)	$ 0.28
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	$ (0.24)	$ 0.27
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	49,814	49,282
DILUTED (in shares)	49,814	50,948

CONDENSED CONSOLIDATED STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
NET INCOME (LOSS)	$ (10,942)	$ 13,764
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Defined benefit pension plan adjustments	381	268
Foreign currency translation adjustments	(1,174)	(54)
Unrealized loss in fair value of investments	(85)	(21)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(878)	193
COMPREHENSIVE INCOME (LOSS)	(11,820)	13,957
LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1,182
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ (13,002)	$ 13,957

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents ($52,871 and $53,067 related to variable interest entities (VIEs))	$ 174,340	$ 192,868
Restricted cash	4,090	4,780
Restricted investments	53,161	53,014
Accounts receivable ($28,076 and $30,003 related to VIEs)	1,236,818	1,265,717
Retainage receivable ($18,627 and $12,410 related to VIEs)	530,897	535,939
Costs and estimated earnings in excess of billings	980,896	932,758
Other current assets ($30,093 and $0 related to VIEs)	132,298	89,316
Total current assets	3,112,500	3,074,392
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $328,443 and $359,188 ($25,072 and $11,641 related to VIEs)	473,178	467,499
GOODWILL	585,006	585,006
INTANGIBLE ASSETS, NET	88,568	89,454
OTHER ASSETS	48,877	47,772
TOTAL ASSETS	4,308,129	4,264,123
CURRENT LIABILITIES:
Current maturities of long-term debt	27,165	30,748
Accounts payable ($9,183 and $19,243 related to VIEs)	659,290	699,971
Retainage payable	246,033	261,820
Billings in excess of cost and estimated earnings ($199,618 and $120,952 related to VIEs)	508,616	456,869
Accrued expenses and other current liabilities	118,334	132,438
Total current liabilities	1,559,438	1,581,846
LONG-TERM DEBT, less current maturities, net of unamortized discounts and debt issuance costs totaling $43,064 and $45,631	790,119	705,528
DEFERRED INCOME TAXES	106,763	108,504
OTHER LONG-TERM LIABILITIES	166,205	163,465
TOTAL LIABILITIES	2,622,525	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 49,913,003 and 49,781,010 shares	49,913	49,781
Additional paid-in capital	1,087,164	1,084,205
Retained earnings	606,199	622,007
Accumulated other comprehensive loss	(43,596)	(42,718)
Total stockholders' equity	1,699,680	1,713,275
Noncontrolling interests	(14,076)	(8,495)
TOTAL EQUITY	1,685,604	1,704,780
TOTAL LIABILITIES AND EQUITY	$ 4,308,129	$ 4,264,123

CONDENSED CONSOLIDATED BALANCE5

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 174,340	$ 192,868
Accounts receivable	1,236,818	1,265,717
Retainage receivable	530,897	535,939
Other current assets	132,298	89,316
Accumulated depreciation	328,443	359,188
PROPERTY AND EQUIPMENT, net of accumulated depreciation	473,178	467,499
Accounts payable	659,290	699,971
Billings in excess of cost and estimated earnings	508,616	456,869
Unamortized discounts and debt issuance costs	$ 43,064	$ 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	49,913,003	49,781,010
Common stock, shares outstanding	49,913,003	49,781,010
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents	$ 52,871	$ 53,067
Accounts receivable	28,076	30,003
Retainage receivable	18,627	12,410
Other current assets	30,093	0
PROPERTY AND EQUIPMENT, net of accumulated depreciation	25,072	11,641
Accounts payable	9,183	19,243
Billings in excess of cost and estimated earnings	$ 199,618	$ 120,952

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ (10,942)	$ 13,764
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	9,301	20,110
Amortization of intangible assets	886	886
Share-based compensation expense	6,081	4,306
Change in debt discounts and deferred debt issuance costs	2,927	3,836
Deferred income taxes	186	(526)
Loss (gain) on sale of property and equipment	1,471	(131)
Other long-term liabilities	1,139	(1,824)
Other	(180)	267
Changes in other components of working capital	(84,272)	(73,533)
NET CASH USED IN OPERATING ACTIVITIES	(73,403)	(32,845)
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(19,970)	(5,672)
Proceeds from sale of property and equipment	3,303	259
Investments in securities restricted in use	(3,288)
Proceeds from maturities and sales of investments in securities	3,007
NET CASH USED IN INVESTING ACTIVITIES	(16,948)	(5,413)
Cash Flows from Financing Activities:
Proceeds from debt	665,000	313,977
Repayment of debt	(586,559)	(296,485)
Issuance of common stock and effect of cashless exercise	(2,308)	(10,809)
Distributions paid to noncontrolling interests	(5,000)
Debt issuance and extinguishment costs		(57)
NET CASH PROVIDED BY FINANCING ACTIVITIES	71,133	6,626
Net decrease in cash, cash equivalents and restricted cash	(19,218)	(31,632)
Cash, cash equivalents and restricted cash at beginning of period	197,648	196,607
Cash, cash equivalents and restricted cash at end of period	$ 178,430	$ 164,975

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 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 accounting principles generally accepted 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 months ended March 31, 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 March 31, 2018 and its consolidated results of operations and cash flows for the interim periods presented. All significant intercompany transactions of consolidated subsidiaries have been eliminated. 

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	(2) Recent Accounting Pronouncements  New accounting pronouncements implemented by the Company during the three months ended March 31, 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 impacts of adoption on the Company’s opening balance sheet were 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:      Adjustments  BALANCE SHEET Balance as of 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 Operations and Condensed Consolidated Balance Sheet were as follows:     Three Months Ended March 31, 2018  Balance Without  STATEMENT OF OPERATIONS Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 1,028,156 $ 1,030,268 $ (2,112)  COST OF OPERATIONS (961,088) (962,855) 1,767  GROSS PROFIT 67,068 67,413 (345)  General and administrative expenses (67,993) (67,993) —  LOSS FROM CONSTRUCTION OPERATIONS (925) (580) (345)  Other income, net 780 780 —  Interest expense (15,065) (15,065) —  LOSS BEFORE INCOME TAXES (15,210) (14,865) (345)  Income tax benefit 4,268 4,156 112  NET LOSS (10,942) (10,709) (233)  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 1,182 1,142 40  NET LOSS ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ (12,124) $ (11,851) $ (273)      As of March 31, 2018  Balance Without  BALANCE SHEET Adoption of Effect of  (in thousands) As Reported ASC 606 Change  ASSETS  Accounts receivable $ 1,236,818 $ 1,765,769 $ (528,951)  Retainage receivable 530,897 — 530,897  Costs and estimated earnings in excess of billings 980,896 982,302 (1,406)  Other current assets 132,298 97,758 34,540   LIABILITIES  Accounts payable $ 659,290 $ 905,323 $ (246,033)  Retainage payable 246,033 — 246,033  Billings in excess of costs and estimated earnings 508,616 466,179 42,437  Accrued expenses and other current liabilities 118,334 118,610 (276)  Deferred income taxes 106,763 108,135 (1,372)   EQUITY  Retained earnings $ 606,199 $ 610,234 $ (4,035)  Noncontrolling interests (14,076) (12,402) (1,674)  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 a decrease of net cash used in investing activities of $ 9.7 million for the quarter ended March 31, 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), which amends the existing guidance in Accounting Standards Codification (“ASC”) 840, Leases . This amendment requires the recognition of lease assets and lease liabilities by lessees for those leases currently classified as operating leases. Other significant provisions of the amendment include (i) defining the “lease term” to include the non-cancellable period together with periods for which there is a significant economic incentive for the lessee to extend or not terminate the lease; (ii) defining the initial lease liability to be recorded on the balance sheet to contemplate only those variable lease payments that depend on an index or that are in substance “fixed”; and (iii) a dual approach for determining whether lease expense is recognized on a straight-line or accelerated basis, depending on whether the lessee is expected to consume more than an insignificant portion of the leased asset’s economic benefits. This guidance will be effective for interim and annual reporting periods beginning after December 15, 2018 and will be applied using the modified retrospective transition method for existing leases. The Company is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements.  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 does not expect the adoption of this ASU 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	3 Months Ended
	Mar. 31, 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. The estimates used during the contract performance period require judgment and making assumptions as to the occurrence of future events and the likelihood 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. The Company estimates variable consideration at the most likely amount to which 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  Ended March 31,  (in thousands) 2018  Civil segment revenue by end market:  Mass transit $ 150,126  Bridges 62,811  Highways 17,257  Other 32,920  Total Civil segment revenue $ 263,114      Three Months  Ended March 31,  (in thousands) 2018  Building segment revenue by end market:  Office $ 147,322  Hospitality and gaming 81,765  Health care facilities 75,081  Municipal and government 50,452  Mixed use 41,777  Education facilities 32,482  Industrial and commercial 26,425  Other 34,937  Total Building segment revenue $ 490,241      Three Months  Ended March 31,  (in thousands) 2018  Specialty Contractors segment revenue by end market:  Mass transit $ 75,182  Mixed use 47,857  Industrial and commercial 39,339  Transportation 33,985  Education facilities 25,304  Condominiums 23,089  Health care facilities 16,365  Other 13,680  Total Specialty Contractors segment revenue $ 274,801      Three Months Ended March 31, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by customer type:  State and local agencies $ 226,351 $ 115,986 $ 106,320 $ 448,657  Federal agencies 9,855 44,311 18,723 72,889  Private owners 26,908 329,944 149,758 506,610  Total revenue $ 263,114 $ 490,241 $ 274,801 $ 1,028,156  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 primarily pursuant to 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 the government, among other reasons.     Three Months Ended March 31, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by contract type:  Fixed price $ 183,904 $ 79,001 $ 247,424 $ 510,329  Guaranteed maximum price 5,072 262,028 15,579 282,679  Unit price 68,754 8,816 6,658 84,228  Cost plus fee and other 5,384 140,396 5,140 150,920  Total revenue $ 263,114 $ 490,241 $ 274,801 $ 1,028,156  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 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 completed 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 months ended March 31, 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 excludes unexercised contract options. As of March 31, 2018, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts are $4.5 billion, $2.2 billion and $1.8 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	3 Months Ended
	Mar. 31, 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 March 31, As of January 1,  (in thousands) 2018 2018  Retainage receivable $ 530,897 $ 535,939  Costs and estimated earnings in excess of billings:  Claims 577,811 549,849  Unapproved change orders 324,851 296,591  Other unbilled costs and profits 78,234 86,318  Total costs and estimated earnings in excess of billings 980,896 932,758  Capitalized contract costs 35,746 32,773  Total contract assets $ 1,547,539 $ 1,501,470  Retainage receivables represent amounts invoiced to customers where payments have been withheld pending the completion of certain milestones, other contractual conditions or upon 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. The amount of costs and estimated earnings in excess of billings as of March 31, 2018 estimated by management to be collected beyond one year is $465.8 million.  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 months ended March 31, 2018, $4.1 million of previously capitalized contract costs were amortized and recognized as expense on the related contracts.  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 March 31, As of January 1,  (in thousands) 2018 2018  Retainage payable $ 246,033 $ 261,820  Billings in excess of costs and estimated earnings 508,616 496,654  Total contract liabilities $ 754,649 $ 758,474  Retainage payables represent amounts invoiced to the Company by subcontractors where payments have been withheld pending the completion of certain milestones, other contractual conditions or upon the completion of the project. Generally, retainage payables are not remitted to subcontractors until the associated retainage receivables from customers are 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. The amount of revenue recognized during the three months ended March 31, 2018 that was included in the opening billings in excess of costs and estimated earnings balance was $ 222.9 million.

Cash, Cash Equivalents And Rest

Cash, Cash Equivalents And Restricted Cash	3 Months Ended
	Mar. 31, 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 March 31, As of December 31,  (in thousands) 2018 2017  Cash and cash equivalents available for general corporate purposes $ 75,423 $ 94,713  Joint venture cash and cash equivalents 98,917 98,155  Cash and cash equivalents 174,340 192,868  Restricted cash 4,090 4,780  Total cash, cash equivalents and restricted cash $ 178,430 $ 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)	3 Months Ended
	Mar. 31, 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. The Company calculates the effect of these potentially dilutive securities using the treasury stock method for restricted stock units and stock options.     Three Months Ended March 31,  (in thousands, except per common share data) 2018 2017  Net income (loss) attributable to Tutor Perini Corporation $ (12,124) $ 13,764   Weighted-average common shares outstanding, basic 49,814 49,282  Effect of dilutive restricted stock units and stock options — 1,666  Weighted-average common shares outstanding, diluted 49,814 50,948   Net income (loss) attributable to Tutor Perini Corporation per common share:  Basic $ (0.24) $ 0.28  Diluted $ (0.24) $ 0.27   Anti-dilutive securities not included above 4,507 930  All restricted stock units and stock options that were outstanding during the three months ended March 31, 2018 were excluded from weighted-average diluted shares outstanding as the shares would have an anti-dilutive effect on the net loss for the period. With regard to diluted EPS and the impact of the Convertible Notes on the diluted EPS calculation, because the Company has the intent and ability to settle the principal amount of the Convertible Notes in cash, per ASC 260, Earnings Per Share, the settlement of the principal amount has no impact on diluted EPS.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Taxes [Abstract]
Income Taxes	(7) Income Taxes  The Company’s effective income tax rate for the three months ended March 31, 2018 was 28.1% compared to 37.1% for the three months ended March 31, 2017. The effective tax rate for the 2018 period reflects 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 the rate for the 2017 period was favorably impacted by certain tax benefits associated with share-based compensation. For the three months ended March 31, 2018 and 2017, the effective tax rate was higher than the federal statutory rate primarily due to state income taxes, while the 2017 period was also favorably impacted by the tax benefits associated with share-based compensation mentioned above.

Financial Commitments

Financial Commitments	3 Months Ended
	Mar. 31, 2018
Financial Commitments [Abstract]
Financial Commitments	(8) Financial Commitments  Long-Term Debt  Long-term debt consisted of the following as of the dates of the Condensed Consolidated Balance Sheets presented:      As of March 31, As of December 31,  (in thousands) 2018 2017  2017 Senior Notes $ 492,926 $ 492,734  Convertible Notes 164,010 161,635  2017 Credit Facility 86,500 —  Equipment financing and mortgages 70,629 76,820  Other indebtedness 3,219 5,087  Total debt 817,284 736,276  Less: Current maturities 27,165 30,748  Long-term debt, net $ 790,119 $ 705,528  The following table reconciles the outstanding debt balance to the reported debt balances as of March 31, 2018 and December 31, 2017:      As of March 31, 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 $ (7,074) $ 492,926 $ 500,000 $ (7,266) $ 492,734  Convertible Notes 200,000 (35,990) 164,010 200,000 (38,365) 161,635  The unamortized issuance costs related to the 2017 Credit Facility were $5.8 million and $6.2 million as of March 31, 2018 and December 31, 2017, respectively, and is 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 margin over (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 4.33% during the three months ended March 31, 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 March 31, 2018, there was $ 264 million available under the 2017 Revolver, and the Company had not utilized the 2017 Credit Facility for letters of credit. The Company was in compliance with the financial covenants under the 2017 Credit Facility as of March 31, 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 March 31, 2018, the conversion provisions of the Convertible Notes have not been triggered.  Interest Expense  Interest expense as reported in the Condensed Consolidated Statements of Operations consists of the following:     Three Months Ended  March 31,  (in thousands) 2018 2017  Cash interest expense:  Interest on 2017 Senior Notes $ 8,594 $ —  Interest on Convertible Notes 1,438 1,438  Interest on 2017 Credit Facility 1,349 —  Interest on 2010 Senior Notes — 5,719  Interest on 2014 Credit Facility — 3,709  Other interest 757 862  Total cash interest expense 12,138 11,728   Non-cash interest expense: (a)  Amortization of discount and debt issuance costs on Convertible Notes 2,376 2,164  Amortization of debt issuance costs on 2017 Credit Facility 360 —  Amortization of debt issuance costs on 2017 Senior Notes 191 —  Amortization of debt issuance costs on 2014 Credit Facility — 1,418  Amortization of discount and debt issuance costs on 2010 Senior Notes — 254  Total non-cash interest expense 2,927 3,836   Total interest expense $ 15,065 $ 15,564 (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 three months ended March 31, 2018.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 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 for the New York State Department of Transportation (the “NYSDOT”). The $130 million project was substantially completed in January 2004 and was accepted by the 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 the NYSDOT is responsible.  In March 2011, the Company filed its claim and complaint with the New York State Court of Claims and served to the New York State Attorney General’s Office, seeking damages in the amount of $53.8 million. In May 2011, the 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 the 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. The Company re-filed its claim in the amount of $53.8 million with the NYSDOT in February 2012 and with the Court of Claims in March 2012. In May 2012, the NYSDOT served its answer and counterclaims in the amount of $151 million alleging fraud in the inducement and punitive damages related to 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 the City’s affirmative defenses and affirmative counterclaims based on DBE fraud. The Company does not expect the counterclaims to have any material effect on its consolidated financial statements. Discovery was completed during 2017 and the Company is currently awaiting the court to set a trial date.  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 (the “District Court”), 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 relating to certain priming liens, there was approximately $125 million 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 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 lower district court’s judgment, and following further proceedings in the lower district court, 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 Court issued several post-appeal orders confirming its previous rulings. Some of those matters are subject to a current further appeal. Once resolved, TSC will seek an order from the Court seeking a remaining $4 million in interest and fees associated with the matter.  The Company does not expect ultimate resolution of this matter to have any 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 March 31, 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. Trial is scheduled for October 2018. Discovery is ongoing.  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 is set for April 2019. Discovery is stayed pending an interlocutory appeal currently taking place in the matter. A motion to lift the stay for the purposes of discovery is pending.  As of March 31, 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	3 Months Ended
	Mar. 31, 2018
Share-Based Compensation [Abstract]
Share-Based Compensation	(10) Share-Based Compensation  As of March 31, 2018, there were 982,458 shares of common stock available for grant under the Company’s stock incentive plans. During the first three months of 2018 and 2017, the Company issued the following share-based instruments: (1) restricted stock units of 514,000 and 665,000 with weighted-average fair values per share of $ 26.49 and $ 30.48 , respectively; (2) stock options of 479,000 and 265,000 with weighted-average fair values per share of $11.82 and $13.70 , respectively, and weighted-average per share exercise prices of $ 24.53 and $23 .47 , respectively. In addition, during the three months ended March 31, 2018, the Company issued 10,000 unrestricted stock units with a weighted-average fair value per share of $25.40 .  The fair value of restricted stock units was 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 are based on the Black-Scholes model. The fair value of certain performance-based awards were estimated taking into account the features of such awards. The fair value of stock options granted during the first three months of 2018 was determined using the Black-Scholes model based on the following weighted-average assumptions: (i) expected life of 5.2 years, (ii) expected volatility of 42.01% , (iii) risk-free rate of 2.36% , and (iv) no quarterly dividends.   For the three months ended March 31, 2018 and 2017, the Company recognized, as part of general and administrative expenses, costs for share-based payment arrangements totaling $6.1 million and $4.3 million, respectively. As of March 31, 2018, the balance of unamortized share-based compensation expense was $38.9 million, which will be recognized over a weighted-average period of 2.3 years.

Employee Pension Plans

Employee Pension Plans	3 Months Ended
	Mar. 31, 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 months ended March 31, 2018 and 2017 :      Three Months Ended March 31,  (in thousands) 2018 2017  Interest cost $ 883 $ 975  Expected return on plan assets (1,077) (1,088)  Amortization of net loss 513 456  Other 213 213  Net periodic benefit cost $ 532 $ 556  The Company contributed $0.8 million to its defined benefit pension plan during each of the three months ended March 31, 2018 and 2017 , and expects to contribute an additional $2.0 million later in 2018 .

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 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 March 31, 2018 and December 31, 2017:      As of March 31, 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) $ 174,340 $ — $ — $ 174,340 $ 192,868 $ — $ — $ 192,868  Restricted cash (a) 4,090 — — 4,090 4,780 — — 4,780  Investments in lieu of retainage (b) 65,708 2,101 — 67,809 69,891 2,405 — 72,296  Total $ 244,138 $ 2,101 $ — $ 246,239 $ 267,539 $ 2,405 $ — $ 269,944 (a) Includes money market funds with original maturity dates of three months or less. (b) Investments in lieu of retainage are included in retainage receivable and are comprised of money market funds and municipal bonds, 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. All of the above investments are available-for-sale securities.  The Company did no t have material transfers between Levels 1 and 2 during the three months ended March 31, 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. The Company’s restricted investments carried at amortized cost have an aggregate fair value of $ 52.5 million as of March 31, 2018 and December 31, 2017, determined using Level 2 inputs. Of the Company’s long-term debt, the fair value of the 2017 Senior Notes was $515.0 million and $537.5 million as of March 31, 2018 and December 31, 2017, respectively. The fair value of the Convertible Notes was $ 210.2 million and $222.2 million as of March 31, 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 March 31, 2018 and December 31, 2017 approximates fair value.

Variable Interest Entities (VIE

Variable Interest Entities (VIE)	3 Months Ended
	Mar. 31, 2018
Variable Interest Entities (VIE) [Abstract]
Variable Interest Entities (VIE)	(13) Variable Interest Entities (VIE)  From time to time 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 , 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 March 31, 2018, the Company had unconsolidated VIE-related current assets and liabilities of $2.4 million and $2.4 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 March 31, 2018.  As of March 31, 2018, the Company’s Condensed Consolidated Balance Sheet included current and noncurrent assets of $ 130.8 million and $ 25.1 million, respectively, as well as current liabilities of $ 211.0 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.  One large joint venture that the Company is consolidating was established to construct the Purple Line Segment 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 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. According to the terms of the joint venture agreement, the partners may be required to initially finance the joint venture with capital contributions from the partners. 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)	3 Months Ended
	Mar. 31, 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 March 31, 2018 and 2017 are as follows:      Three Months Ended Three Months Ended  March 31, 2018 March 31, 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 $ 532 $ (151) $ 381 $ 455 $ (187) $ 268  Foreign currency translation adjustments (1,638) 464 (1,174) (92) 38 (54)  Unrealized (loss) gain in fair value of investments (119) 34 (85) (36) 15 (21)  Total other comprehensive income (loss) (1,225) 347 (878) 327 (134) 193  Total other comprehensive income (loss) attributable to Tutor Perini Corporation $ (1,225) $ 347 $ (878) $ 327 $ (134) $ 193  The changes in AOCI balances by component (after tax) during the three months ended March 31, 2018 and 2017 are as follows:      Three Months Ended March 31, 2018  Defined Unrealized Accumulated  Benefit Foreign Gain 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 loss before reclassifications — (1,174) (85) (1,259)  Amounts reclassified from AOCI 381 — — 381  Total other comprehensive income (loss) 381 (1,174) (85) (878)  Balance as of March 31, 2018 $ (39,060) $ (4,765) $ 229 $ (43,596)      Three Months Ended March 31, 2017  Defined Unrealized Accumulated  Benefit Foreign Gain in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as or December 31, 2016 $ (40,865) $ (4,864) $ 316 $ (45,413)  Other comprehensive loss before reclassifications — (54) (21) (75)  Amounts reclassified from AOCI 268 — — 268  Total other comprehensive income (loss) 268 (54) (21) 193  Balance as of March 31, 2017 $ (40,597) $ (4,918) $ 295 $ (45,220)

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 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 heating, ventilation and air conditioning (HVAC). 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 risk management.  The following tables set forth certain reportable segment information relating to the Company’s operations for the three months ended March 31, 2018 and 2017:      Reportable Segments  Specialty Consolidated  (in thousands) Civil Building Contractors Total Corporate Total  Three Months Ended March 31, 2018  Total revenue $ 325,400 $ 490,617 $ 274,801 $ 1,090,818 $ — $ 1,090,818  Elimination of intersegment revenue (62,286) (376) — (62,662) — (62,662)  Revenue from external customers $ 263,114 $ 490,241 $ 274,801 $ 1,028,156 $ — $ 1,028,156  Income (loss) from construction operations $ 2,839 $ 6,425 $ 7,235 $ 16,499 $ (17,424) (a) $ (925)  Capital expenditures $ 19,196 $ 278 $ 419 $ 19,893 $ 77 $ 19,970  Depreciation and amortization (b) $ 5,756 $ 481 $ 1,112 $ 7,349 $ 2,838 $ 10,187   Three Months Ended March 31, 2017  Total revenue $ 338,108 $ 515,251 $ 315,696 $ 1,169,055 $ — $ 1,169,055  Elimination of intersegment revenue (33,533) (18,161) — (51,694) — (51,694)  Revenue from external customers $ 304,575 $ 497,090 $ 315,696 $ 1,117,361 $ — $ 1,117,361  Income from construction operations $ 31,888 $ 5,242 $ 14,762 $ 51,892 $ (14,875) (a) $ 37,017  Capital expenditures $ 5,567 $ 45 $ 6 $ 5,618 $ 54 $ 5,672  Depreciation and amortization (b) $ 16,318 $ 518 $ 1,192 $ 18,028 $ 2,968 $ 20,996 (a) Consists primarily of corporate general and administrative expenses. (b) Depreciation and amortization is included in income from construction operations.  During the three months ended March 31, 2018, the Company recorded a charge of $17.8 million in income from construction operations (an after-tax impact of $12.7 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 (for further information, see Note 17, Subsequent Event ).  A reconciliation of segment results to the consolidated income before income taxes is as follows:      Three Months Ended March 31,  (in thousands) 2018 2017  Income (Loss) from construction operations $ (925) $ 37,017  Other income, net 780 417  Interest expense (15,065) (15,564)  Income (Loss) before income taxes $ (15,210) $ 21,870  Total assets by segment are as follows:      As of As of  (in thousands) March 31, 2018 December 31, 2017  Civil $ 2,404,703 $ 2,452,108  Building 926,789 909,207  Specialty Contractors 763,933 767,807  Corporate and other (a) 212,704 135,001  Total assets $ 4,308,129 $ 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	3 Months Ended
	Mar. 31, 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 two joint ventures with O&G for infrastructure projects in the northeastern United States that are both complete. In addition, the Company has a 75% interest in a joint venture with O&G (as the 25% interest holder) for a 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 ventures to O&G during the three months ended March 31, 2018 and 2017. 

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2018
Subsequent Event [Abstract]
Subsequent Event	(17) Subsequent Event  On April 26, 2018, the Company received an unfavorable arbitration decision related to a subcontract back charge dispute on a Civil segment project in New York that was completed in 2013. The decision resulted in an unexpected pre-tax charge of $17.8 million (primarily non-cash) associated with costs for which recovery was previously recorded in accordance with ASC 606 and ASC 605-35, Construction-Type and Production-Type Contracts . The charge was reflected in the results for the three months ended March 31, 2018. 

Recent Accounting Pronounceme24

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 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 impacts of adoption on the Company’s opening balance sheet were 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:      Adjustments  BALANCE SHEET Balance as of 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 Operations and Condensed Consolidated Balance Sheet were as follows:     Three Months Ended March 31, 2018  Balance Without  STATEMENT OF OPERATIONS Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 1,028,156 $ 1,030,268 $ (2,112)  COST OF OPERATIONS (961,088) (962,855) 1,767  GROSS PROFIT 67,068 67,413 (345)  General and administrative expenses (67,993) (67,993) —  LOSS FROM CONSTRUCTION OPERATIONS (925) (580) (345)  Other income, net 780 780 —  Interest expense (15,065) (15,065) —  LOSS BEFORE INCOME TAXES (15,210) (14,865) (345)  Income tax benefit 4,268 4,156 112  NET LOSS (10,942) (10,709) (233)  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 1,182 1,142 40  NET LOSS ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ (12,124) $ (11,851) $ (273)      As of March 31, 2018  Balance Without  BALANCE SHEET Adoption of Effect of  (in thousands) As Reported ASC 606 Change  ASSETS  Accounts receivable $ 1,236,818 $ 1,765,769 $ (528,951)  Retainage receivable 530,897 — 530,897  Costs and estimated earnings in excess of billings 980,896 982,302 (1,406)  Other current assets 132,298 97,758 34,540   LIABILITIES  Accounts payable $ 659,290 $ 905,323 $ (246,033)  Retainage payable 246,033 — 246,033  Billings in excess of costs and estimated earnings 508,616 466,179 42,437  Accrued expenses and other current liabilities 118,334 118,610 (276)  Deferred income taxes 106,763 108,135 (1,372)   EQUITY  Retained earnings $ 606,199 $ 610,234 $ (4,035)  Noncontrolling interests (14,076) (12,402) (1,674)  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 a decrease of net cash used in investing activities of $ 9.7 million for the quarter ended March 31, 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), which amends the existing guidance in Accounting Standards Codification (“ASC”) 840, Leases . This amendment requires the recognition of lease assets and lease liabilities by lessees for those leases currently classified as operating leases. Other significant provisions of the amendment include (i) defining the “lease term” to include the non-cancellable period together with periods for which there is a significant economic incentive for the lessee to extend or not terminate the lease; (ii) defining the initial lease liability to be recorded on the balance sheet to contemplate only those variable lease payments that depend on an index or that are in substance “fixed”; and (iii) a dual approach for determining whether lease expense is recognized on a straight-line or accelerated basis, depending on whether the lessee is expected to consume more than an insignificant portion of the leased asset’s economic benefits. This guidance will be effective for interim and annual reporting periods beginning after December 15, 2018 and will be applied using the modified retrospective transition method for existing leases. The Company is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements.  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 does not expect the adoption of this ASU 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 Pronounceme25

Recent Accounting Pronouncements (Tables)	3 Months Ended
	Mar. 31, 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:      Adjustments  BALANCE SHEET Balance as of 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 Operations and Condensed Consolidated Balance Sheet were as follows:     Three Months Ended March 31, 2018  Balance Without  STATEMENT OF OPERATIONS Adoption of Effect of  (in thousands) As Reported ASC 606 Change  REVENUE $ 1,028,156 $ 1,030,268 $ (2,112)  COST OF OPERATIONS (961,088) (962,855) 1,767  GROSS PROFIT 67,068 67,413 (345)  General and administrative expenses (67,993) (67,993) —  LOSS FROM CONSTRUCTION OPERATIONS (925) (580) (345)  Other income, net 780 780 —  Interest expense (15,065) (15,065) —  LOSS BEFORE INCOME TAXES (15,210) (14,865) (345)  Income tax benefit 4,268 4,156 112  NET LOSS (10,942) (10,709) (233)  LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 1,182 1,142 40  NET LOSS ATTRIBUTABLE TO TUTOR PERINI CORPORATION $ (12,124) $ (11,851) $ (273)      As of March 31, 2018  Balance Without  BALANCE SHEET Adoption of Effect of  (in thousands) As Reported ASC 606 Change  ASSETS  Accounts receivable $ 1,236,818 $ 1,765,769 $ (528,951)  Retainage receivable 530,897 — 530,897  Costs and estimated earnings in excess of billings 980,896 982,302 (1,406)  Other current assets 132,298 97,758 34,540   LIABILITIES  Accounts payable $ 659,290 $ 905,323 $ (246,033)  Retainage payable 246,033 — 246,033  Billings in excess of costs and estimated earnings 508,616 466,179 42,437  Accrued expenses and other current liabilities 118,334 118,610 (276)  Deferred income taxes 106,763 108,135 (1,372)   EQUITY  Retained earnings $ 606,199 $ 610,234 $ (4,035)  Noncontrolling interests (14,076) (12,402) (1,674) 

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue [Abstract]
Disaggregation Of Revenue	    Three Months  Ended March 31,  (in thousands) 2018  Civil segment revenue by end market:  Mass transit $ 150,126  Bridges 62,811  Highways 17,257  Other 32,920  Total Civil segment revenue $ 263,114      Three Months  Ended March 31,  (in thousands) 2018  Building segment revenue by end market:  Office $ 147,322  Hospitality and gaming 81,765  Health care facilities 75,081  Municipal and government 50,452  Mixed use 41,777  Education facilities 32,482  Industrial and commercial 26,425  Other 34,937  Total Building segment revenue $ 490,241      Three Months  Ended March 31,  (in thousands) 2018  Specialty Contractors segment revenue by end market:  Mass transit $ 75,182  Mixed use 47,857  Industrial and commercial 39,339  Transportation 33,985  Education facilities 25,304  Condominiums 23,089  Health care facilities 16,365  Other 13,680  Total Specialty Contractors segment revenue $ 274,801      Three Months Ended March 31, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by customer type:  State and local agencies $ 226,351 $ 115,986 $ 106,320 $ 448,657  Federal agencies 9,855 44,311 18,723 72,889  Private owners 26,908 329,944 149,758 506,610  Total revenue $ 263,114 $ 490,241 $ 274,801 $ 1,028,156  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 primarily pursuant to 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 the government, among other reasons.     Three Months Ended March 31, 2018  Specialty  (in thousands) Civil Building Contractors Total  Revenue by contract type:  Fixed price $ 183,904 $ 79,001 $ 247,424 $ 510,329  Guaranteed maximum price 5,072 262,028 15,579 282,679  Unit price 68,754 8,816 6,658 84,228  Cost plus fee and other 5,384 140,396 5,140 150,920  Total revenue $ 263,114 $ 490,241 $ 274,801 $ 1,028,156 

Contract Assets And Liabiliti27

Contract Assets And Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Contract Assets and Liabilities [Abstract]
Schedule Of Contract Assets And Liabilities	    As of March 31, As of January 1,  (in thousands) 2018 2018  Retainage receivable $ 530,897 $ 535,939  Costs and estimated earnings in excess of billings:  Claims 577,811 549,849  Unapproved change orders 324,851 296,591  Other unbilled costs and profits 78,234 86,318  Total costs and estimated earnings in excess of billings 980,896 932,758  Capitalized contract costs 35,746 32,773  Total contract assets $ 1,547,539 $ 1,501,470  Retainage receivables represent amounts invoiced to customers where payments have been withheld pending the completion of certain milestones, other contractual conditions or upon 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. The amount of costs and estimated earnings in excess of billings as of March 31, 2018 estimated by management to be collected beyond one year is $465.8 million.  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 months ended March 31, 2018, $4.1 million of previously capitalized contract costs were amortized and recognized as expense on the related contracts.  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 March 31, As of January 1,  (in thousands) 2018 2018  Retainage payable $ 246,033 $ 261,820  Billings in excess of costs and estimated earnings 508,616 496,654  Total contract liabilities $ 754,649 $ 758,474 

Cash, Cash Equivalents And Re28

Cash, Cash Equivalents And Restricted Cash (Tables)	3 Months Ended
	Mar. 31, 2018
Cash, Cash Equivalents and Restricted Cash [Abstract]
Reconciliation Of Cash, Cash Equivalents And Restricted Cash	   As of March 31, As of December 31,  (in thousands) 2018 2017  Cash and cash equivalents available for general corporate purposes $ 75,423 $ 94,713  Joint venture cash and cash equivalents 98,917 98,155  Cash and cash equivalents 174,340 192,868  Restricted cash 4,090 4,780  Total cash, cash equivalents and restricted cash $ 178,430 $ 197,648 

Earnings Per Common Share (EP29

Earnings Per Common Share (EPS) (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Common Share (EPS) [Abstract]
Calculations of the Basic and Diluted EPS	   Three Months Ended March 31,  (in thousands, except per common share data) 2018 2017  Net income (loss) attributable to Tutor Perini Corporation $ (12,124) $ 13,764   Weighted-average common shares outstanding, basic 49,814 49,282  Effect of dilutive restricted stock units and stock options — 1,666  Weighted-average common shares outstanding, diluted 49,814 50,948   Net income (loss) attributable to Tutor Perini Corporation per common share:  Basic $ (0.24) $ 0.28  Diluted $ (0.24) $ 0.27   Anti-dilutive securities not included above 4,507 930 

Financial Commitments (Tables)

Financial Commitments (Tables)	3 Months Ended
	Mar. 31, 2018
Financial Commitments [Abstract]
Long-term Debt	   As of March 31, As of December 31,  (in thousands) 2018 2017  2017 Senior Notes $ 492,926 $ 492,734  Convertible Notes 164,010 161,635  2017 Credit Facility 86,500 —  Equipment financing and mortgages 70,629 76,820  Other indebtedness 3,219 5,087  Total debt 817,284 736,276  Less: Current maturities 27,165 30,748  Long-term debt, net $ 790,119 $ 705,528 
Reconciliation Of Outstanding Debt Balance To Reported Debt Balance	   As of March 31, 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 $ (7,074) $ 492,926 $ 500,000 $ (7,266) $ 492,734  Convertible Notes 200,000 (35,990) 164,010 200,000 (38,365) 161,635 
Summary Of Interest Expense As Reported In The Condensed Consolidated Statements of Operations	   Three Months Ended  March 31,  (in thousands) 2018 2017  Cash interest expense:  Interest on 2017 Senior Notes $ 8,594 $ —  Interest on Convertible Notes 1,438 1,438  Interest on 2017 Credit Facility 1,349 —  Interest on 2010 Senior Notes — 5,719  Interest on 2014 Credit Facility — 3,709  Other interest 757 862  Total cash interest expense 12,138 11,728   Non-cash interest expense: (a)  Amortization of discount and debt issuance costs on Convertible Notes 2,376 2,164  Amortization of debt issuance costs on 2017 Credit Facility 360 —  Amortization of debt issuance costs on 2017 Senior Notes 191 —  Amortization of debt issuance costs on 2014 Credit Facility — 1,418  Amortization of discount and debt issuance costs on 2010 Senior Notes — 254  Total non-cash interest expense 2,927 3,836   Total interest expense $ 15,065 $ 15,564 (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 three months ended March 31, 2018.

Employee Pension Plans (Tables)

Employee Pension Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Employee Pension Plans [Abstract]
Components of Net Periodic Benefit Cost	   Three Months Ended March 31,  (in thousands) 2018 2017  Interest cost $ 883 $ 975  Expected return on plan assets (1,077) (1,088)  Amortization of net loss 513 456  Other 213 213  Net periodic benefit cost $ 532 $ 556 

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	    As of March 31, 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) $ 174,340 $ — $ — $ 174,340 $ 192,868 $ — $ — $ 192,868  Restricted cash (a) 4,090 — — 4,090 4,780 — — 4,780  Investments in lieu of retainage (b) 65,708 2,101 — 67,809 69,891 2,405 — 72,296  Total $ 244,138 $ 2,101 $ — $ 246,239 $ 267,539 $ 2,405 $ — $ 269,944 (a) Includes money market funds with original maturity dates of three months or less. (b) Investments in lieu of retainage are included in retainage receivable and are comprised of money market funds and municipal bonds, 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. All of the above investments are available-for-sale securities.

Other Comprehensive Income (L33

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2018 and 2017 are as follows:      Three Months Ended Three Months Ended  March 31, 2018 March 31, 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 $ 532 $ (151) $ 381 $ 455 $ (187) $ 268  Foreign currency translation adjustments (1,638) 464 (1,174) (92) 38 (54)  Unrealized (loss) gain in fair value of investments (119) 34 (85) (36) 15 (21)  Total other comprehensive income (loss) (1,225) 347 (878) 327 (134) 193  Total other comprehensive income (loss) attributable to Tutor Perini Corporation $ (1,225) $ 347 $ (878) $ 327 $ (134) $ 193 
Schedule Of Changes In AOCI Balances By Component (After-Tax)	The changes in AOCI balances by component (after tax) during the three months ended March 31, 2018 and 2017 are as follows:      Three Months Ended March 31, 2018  Defined Unrealized Accumulated  Benefit Foreign Gain 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 loss before reclassifications — (1,174) (85) (1,259)  Amounts reclassified from AOCI 381 — — 381  Total other comprehensive income (loss) 381 (1,174) (85) (878)  Balance as of March 31, 2018 $ (39,060) $ (4,765) $ 229 $ (43,596)      Three Months Ended March 31, 2017  Defined Unrealized Accumulated  Benefit Foreign Gain in Other  Pension Currency Fair Value of Comprehensive  (in thousands) Plan Translation Investments, Net Loss  Attributable to Tutor Perini Corporation:  Balance as or December 31, 2016 $ (40,865) $ (4,864) $ 316 $ (45,413)  Other comprehensive loss before reclassifications — (54) (21) (75)  Amounts reclassified from AOCI 268 — — 268  Total other comprehensive income (loss) 268 (54) (21) 193  Balance as of March 31, 2017 $ (40,597) $ (4,918) $ 295 $ (45,220) 

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Business Segments [Abstract]
Reportable Segments	   Reportable Segments  Specialty Consolidated  (in thousands) Civil Building Contractors Total Corporate Total  Three Months Ended March 31, 2018  Total revenue $ 325,400 $ 490,617 $ 274,801 $ 1,090,818 $ — $ 1,090,818  Elimination of intersegment revenue (62,286) (376) — (62,662) — (62,662)  Revenue from external customers $ 263,114 $ 490,241 $ 274,801 $ 1,028,156 $ — $ 1,028,156  Income (loss) from construction operations $ 2,839 $ 6,425 $ 7,235 $ 16,499 $ (17,424) (a) $ (925)  Capital expenditures $ 19,196 $ 278 $ 419 $ 19,893 $ 77 $ 19,970  Depreciation and amortization (b) $ 5,756 $ 481 $ 1,112 $ 7,349 $ 2,838 $ 10,187   Three Months Ended March 31, 2017  Total revenue $ 338,108 $ 515,251 $ 315,696 $ 1,169,055 $ — $ 1,169,055  Elimination of intersegment revenue (33,533) (18,161) — (51,694) — (51,694)  Revenue from external customers $ 304,575 $ 497,090 $ 315,696 $ 1,117,361 $ — $ 1,117,361  Income from construction operations $ 31,888 $ 5,242 $ 14,762 $ 51,892 $ (14,875) (a) $ 37,017  Capital expenditures $ 5,567 $ 45 $ 6 $ 5,618 $ 54 $ 5,672  Depreciation and amortization (b) $ 16,318 $ 518 $ 1,192 $ 18,028 $ 2,968 $ 20,996 (a) Consists primarily of corporate general and administrative expenses. (b) Depreciation and amortization is included in income from construction operations.
Reconciliation of Segment Results to Consolidated Income Before Income Taxes	   Three Months Ended March 31,  (in thousands) 2018 2017  Income (Loss) from construction operations $ (925) $ 37,017  Other income, net 780 417  Interest expense (15,065) (15,564)  Income (Loss) before income taxes $ (15,210) $ 21,870 
Schedule of Assets by Segment	   As of As of  (in thousands) March 31, 2018 December 31, 2017  Civil $ 2,404,703 $ 2,452,108  Building 926,789 909,207  Specialty Contractors 763,933 767,807  Corporate and other (a) 212,704 135,001  Total assets $ 4,308,129 $ 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 Pronounceme35

Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Decrease of net cash used in investing activities	$ (16,948)	$ (5,413)
Accounting Standards Update 2016-18 [Member]
Decrease of net cash used in investing activities		$ 9,700

Recent Accounting Pronounceme36

Recent Accounting Pronouncements (Schedule of the Impact for the Adoption of ASU 2014-09) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
ASSETS
Accounts receivable	$ 1,236,818			$ 1,265,717
Retainage receivable	530,897		$ 535,939	535,939
Costs and estimated earnings in excess of billings	980,896		932,758	932,758
Other current assets	132,298			89,316
LIABILITIES
Accounts payable	659,290			699,971
Retainage payable	246,033		261,820	261,820
Billings in excess of cost and estimated earnings	508,616		496,654	456,869
Accrued expenses and other current liabilities	118,334			132,438
Deferred income taxes	106,763			108,504
EQUITY
Retained earnings	606,199			622,007
Noncontrolling interests	(14,076)			(8,495)
STATEMENT OF OPERATIONS
REVENUE	1,028,156	$ 1,117,361
COST OF OPERATIONS	(961,088)	(1,014,641)
GROSS PROFIT	67,068	102,720
General and administrative expenses	(67,993)	(65,703)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	(925)	37,017
Other income, net	780	417
Interest expense	(15,065)	(15,564)
INCOME (LOSS) BEFORE INCOME TAXES	(15,210)	21,870
Income tax benefit	4,268	(8,106)
NET INCOME (LOSS)	(10,942)	13,764
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1,182
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	(12,124)	$ 13,764
Accounting Standards Update 606 [Member]
ASSETS
Accounts receivable	1,236,818		1,265,717
Retainage receivable	530,897		535,939
Costs and estimated earnings in excess of billings	980,896
Other current assets	132,298		122,089
LIABILITIES
Accounts payable	659,290		699,971
Retainage payable	246,033		261,820
Billings in excess of cost and estimated earnings	508,616		496,654
Accrued expenses and other current liabilities	118,334
Deferred income taxes	106,763		106,967
EQUITY
Retained earnings	606,199		618,245
Noncontrolling interests	(14,076)		(10,209)
STATEMENT OF OPERATIONS
REVENUE	1,028,156
COST OF OPERATIONS	(961,088)
GROSS PROFIT	67,068
General and administrative expenses	(67,993)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	(925)
Other income, net	780
Interest expense	(15,065)
INCOME (LOSS) BEFORE INCOME TAXES	(15,210)
Income tax benefit	4,268
NET INCOME (LOSS)	(10,942)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1,182
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	(12,124)
Without Adoption Of ASU 606 [Member]
ASSETS
Accounts receivable	1,765,769			1,801,656
Costs and estimated earnings in excess of billings	982,302
Other current assets	97,758			89,316
LIABILITIES
Accounts payable	905,323			961,791
Billings in excess of cost and estimated earnings	466,179			456,869
Accrued expenses and other current liabilities	118,610
Deferred income taxes	108,135			108,504
EQUITY
Retained earnings	610,234			622,007
Noncontrolling interests	(12,402)			$ (8,495)
STATEMENT OF OPERATIONS
REVENUE	1,030,268
COST OF OPERATIONS	(962,855)
GROSS PROFIT	67,413
General and administrative expenses	(67,993)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	(580)
Other income, net	780
Interest expense	(15,065)
INCOME (LOSS) BEFORE INCOME TAXES	(14,865)
Income tax benefit	4,156
NET INCOME (LOSS)	(10,709)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1,142
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	(11,851)
Adjustments Due To ASU 606 [Member] | Accounting Standards Update 606 [Member]
ASSETS
Accounts receivable	(528,951)		(535,939)
Retainage receivable	530,897		535,939
Costs and estimated earnings in excess of billings	(1,406)
Other current assets	34,540		32,773
LIABILITIES
Accounts payable	(246,033)		(261,820)
Retainage payable	246,033		261,820
Billings in excess of cost and estimated earnings	42,437		39,785
Accrued expenses and other current liabilities	(276)
Deferred income taxes	(1,372)		(1,537)
EQUITY
Retained earnings	(4,035)		(3,762)
Noncontrolling interests	(1,674)		$ (1,714)
STATEMENT OF OPERATIONS
REVENUE	(2,112)
COST OF OPERATIONS	1,767
GROSS PROFIT	(345)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	(345)
INCOME (LOSS) BEFORE INCOME TAXES	(345)
Income tax benefit	112
NET INCOME (LOSS)	(233)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	40
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ (273)

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Income (Loss)	$ (925)	$ 37,017
Civil [Member]
Operating Income (Loss)	2,839	31,888
Revenue, Remaining Performance Obligation	4,500,000
Civil [Member] | Scenario Unfavorable Adjustment [Member]
Operating Income (Loss)	17,800
Building [Member]
Operating Income (Loss)	6,425	5,242
Revenue, Remaining Performance Obligation	2,200,000
Specialty Contractors [Member]
Operating Income (Loss)	7,235	$ 14,762
Revenue, Remaining Performance Obligation	$ 1,800,000
Minimum [Member[ | Civil [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years
Minimum [Member[ | Building And Specialty Contractors [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Maximum [Member] | Civil [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years
Maximum [Member] | Building And Specialty Contractors [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years

Revenue (Disaggregation Of Reve

Revenue (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Contracts Revenue	$ 1,028,156	$ 1,117,361
State And Local Agencies [Member]
Contracts Revenue	448,657
Federal Agencies [Member]
Contracts Revenue	72,889
Private Owners [Member]
Contracts Revenue	506,610
Civil [Member]
Contracts Revenue	263,114	304,575
Civil [Member] | State And Local Agencies [Member]
Contracts Revenue	226,351
Civil [Member] | Federal Agencies [Member]
Contracts Revenue	9,855
Civil [Member] | Private Owners [Member]
Contracts Revenue	26,908
Civil [Member] | Mass Transit [Member]
Contracts Revenue	150,126
Civil [Member] | Bridges [Member]
Contracts Revenue	62,811
Civil [Member] | Highways [Member]
Contracts Revenue	17,257
Civil [Member] | Other [Member]
Contracts Revenue	32,920
Building [Member]
Contracts Revenue	490,241	497,090
Building [Member] | State And Local Agencies [Member]
Contracts Revenue	115,986
Building [Member] | Federal Agencies [Member]
Contracts Revenue	44,311
Building [Member] | Private Owners [Member]
Contracts Revenue	329,944
Building [Member] | Office [Member]
Contracts Revenue	147,322
Building [Member] | Hospitality And Gaming [Member]
Contracts Revenue	81,765
Building [Member] | Health Care Facilities [Member]
Contracts Revenue	75,081
Building [Member] | Municipal And Government [Member]
Contracts Revenue	50,452
Building [Member] | Mixed Use [Member]
Contracts Revenue	41,777
Building [Member] | Education Facilities [Member]
Contracts Revenue	32,482
Building [Member] | Industrial And Commercial [Member]
Contracts Revenue	26,425
Building [Member] | Other [Member]
Contracts Revenue	34,937
Specialty Contractors [Member]
Contracts Revenue	274,801	$ 315,696
Specialty Contractors [Member] | State And Local Agencies [Member]
Contracts Revenue	106,320
Specialty Contractors [Member] | Federal Agencies [Member]
Contracts Revenue	18,723
Specialty Contractors [Member] | Private Owners [Member]
Contracts Revenue	149,758
Specialty Contractors [Member] | Mass Transit [Member]
Contracts Revenue	75,182
Specialty Contractors [Member] | Health Care Facilities [Member]
Contracts Revenue	16,365
Specialty Contractors [Member] | Mixed Use [Member]
Contracts Revenue	47,857
Specialty Contractors [Member] | Education Facilities [Member]
Contracts Revenue	25,304
Specialty Contractors [Member] | Industrial And Commercial [Member]
Contracts Revenue	39,339
Specialty Contractors [Member] | Transportation [Member]
Contracts Revenue	33,985
Specialty Contractors [Member] | Condominiums [Member]
Contracts Revenue	23,089
Specialty Contractors [Member] | Other [Member]
Contracts Revenue	$ 13,680

Revenue (Schedule Of Revenue By

Revenue (Schedule Of Revenue By Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Contracts Revenue	$ 1,028,156	$ 1,117,361
Fixed Price [Member]
Contracts Revenue	510,329
Guaranteed Maximum Price [Member]
Contracts Revenue	282,679
Unit Price [Member]
Contracts Revenue	84,228
Cost Plus Fee And Other [Member]
Contracts Revenue	150,920
Civil [Member]
Contracts Revenue	263,114	304,575
Civil [Member] | Fixed Price [Member]
Contracts Revenue	183,904
Civil [Member] | Guaranteed Maximum Price [Member]
Contracts Revenue	5,072
Civil [Member] | Unit Price [Member]
Contracts Revenue	68,754
Civil [Member] | Cost Plus Fee And Other [Member]
Contracts Revenue	5,384
Building [Member]
Contracts Revenue	490,241	497,090
Building [Member] | Fixed Price [Member]
Contracts Revenue	79,001
Building [Member] | Guaranteed Maximum Price [Member]
Contracts Revenue	262,028
Building [Member] | Unit Price [Member]
Contracts Revenue	8,816
Building [Member] | Cost Plus Fee And Other [Member]
Contracts Revenue	140,396
Specialty Contractors [Member]
Contracts Revenue	274,801	$ 315,696
Specialty Contractors [Member] | Fixed Price [Member]
Contracts Revenue	247,424
Specialty Contractors [Member] | Guaranteed Maximum Price [Member]
Contracts Revenue	15,579
Specialty Contractors [Member] | Unit Price [Member]
Contracts Revenue	6,658
Specialty Contractors [Member] | Cost Plus Fee And Other [Member]
Contracts Revenue	$ 5,140

Contract Assets And Liabiliti40

Contract Assets And Liabilities (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Contract Assets and Liabilities [Abstract]
Costs and estimated earnings in excess of billings beyond one year	$ 465.8
Capitalized contract costs were amortized and recognized as expense	4.1
Contract with Customer, Liability, Revenue Recognized	$ 222.9

Contract Assets And Liabiliti41

Contract Assets And Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract Assets and Liabilities [Abstract]
Retainage receivable	$ 530,897	$ 535,939	$ 535,939
Claims	577,811	549,849
Unapproved change orders	324,851	296,591
Other unbilled costs and profits	78,234	86,318
Total costs and estimated earnings in excess of billings	980,896	932,758	$ 932,758
Capitalized contract costs	35,746	32,773
Total contract assets	$ 1,547,539	$ 1,501,470

Contract Assets And Liabiliti42

Contract Assets And Liabilities (Schedule Of Contract Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract Assets and Liabilities [Abstract]
Retainage payable	$ 246,033	$ 261,820	$ 261,820
Billings in excess of cost and estimated earnings	508,616	496,654	$ 456,869
Total contract liabilities	$ 754,649	$ 758,474

Cash, Cash Equivalents And Re43

Cash, Cash Equivalents And Restricted Cash (Reconciliation Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 174,340	$ 192,868
Restricted cash	4,090	4,780
Total cash, cash equivalents and restricted cash	178,430	197,648	$ 164,975	$ 196,607
Tutor Perini Corporation [Member]
Cash and cash equivalents	75,423	94,713
Joint Venture [Member]
Cash and cash equivalents	$ 98,917	$ 98,155

Earnings Per Common Share (EP44

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
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Common Share (EPS) [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ (12,124)	$ 13,764
Weighted-average common shares outstanding, basic	49,814	49,282
Effect of dilutive restricted stock units and stock options		1,666
Weighted-average common shares outstanding, diluted	49,814	50,948
Net income (loss) attributable to Tutor Perini Corporation per common share: Basic	$ (0.24)	$ 0.28
Net income (loss) attributable to Tutor Perini Corporation per common share: Diluted	$ (0.24)	$ 0.27
Anti-dilutive securities not included above	4,507	930

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Effective income tax rate	(28.10%)	37.10%
Federal statutory income tax rate	21.00%		35.00%

Financial Commitments (Narrativ

Financial Commitments (Narrative) (Details)	Apr. 20, 2017USD ($)	Mar. 31, 2018USD ($)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		264,000,000
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		4.33%
Fixed charge coverage ratio		1.25
Debt issuance costs		$ 5,800,000	$ 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	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 817,284	$ 736,276
Less: Current maturities	27,165	30,748
Long-term debt, net	790,119	705,528
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt	164,010	161,635
Equipment Financing And Mortgages [Member]
Debt Instrument [Line Items]
Total debt	70,629	76,820
Other Indebtedness [Member]
Debt Instrument [Line Items]
Total debt	3,219	5,087
2017 Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	492,926	$ 492,734
2017 Credit Facility [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 86,500

Financial Commitments (Reconcil

Financial Commitments (Reconciliation Of Outstanding Debt Balance To Reported Debt Balance) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized Discount and Issuance Costs	$ (43,064)	$ (45,631)
Total debt	817,284	736,276
Convertible Notes [Member]
Debt Instrument [Line Items]
Outstanding Long-Term Debt	200,000	200,000
Unamortized Discount and Issuance Costs	(35,990)	(38,365)
Total debt	164,010	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	(7,074)	(7,266)
Total debt	$ 492,926	$ 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
	Mar. 31, 2018	Mar. 31, 2017
Other interest	$ 757	$ 862
Total cash interest expense	12,138	11,728
Total non-cash interest expense	2,927	3,836
Total interest expense	15,065	15,564
Convertible Notes [Member]
Interest on debt	1,438	1,438
Total non-cash interest expense	$ 2,376	2,164
Effective interest rates	9.39%
2017 Senior Notes [Member] | Senior Notes [Member]
Interest on debt	$ 8,594
Total non-cash interest expense	$ 191
Effective interest rates	7.13%
2017 Credit Facility [Member] | Credit Facility [Member]
Interest on debt	$ 1,349
Total non-cash interest expense	$ 360
2010 Senior Notes [Member] | Senior Notes [Member]
Interest on debt		5,719
Total non-cash interest expense		254
2014 Credit Facility [Member] | Credit Facility [Member]
Interest on debt		3,709
Total non-cash interest expense		$ 1,418

Commitments and Contingencies (

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

Mar. 20, 2014USD ($)

Mar. 31, 2011USD ($)

Dec. 31, 2017USD ($)

Dec. 31, 2009USD ($)room

Mar. 31, 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

$ 53.8

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
	Mar. 31, 2018	Mar. 31, 2017
Share-Based Compensation [Line Items]
Number of shares available for grant	982,458
Expected life	5 years 2 months 12 days
Expected volatility	42.01%
Risk-free rate	2.36%
Quarterly dividends	$ 0
Share-based compensation expense	6,081,000	$ 4,306,000
Unamortized share-based compensation expense	$ 38,900,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 3 months 18 days
Restricted Stock Units [Member]
Share-Based Compensation [Line Items]
Units granted	514,000	665,000
Weighted-average per share prices	$ 26.49	$ 30.48
Stock Options [Member]
Share-Based Compensation [Line Items]
Stock options awarded	479,000	265,000
Weighted-average exercise prices	$ 24.53	$ 23.47
Weighted average grant date fair value	$ 11.82	$ 13.70
Unrestricted Stock Units [Member]
Share-Based Compensation [Line Items]
Units granted	10,000
Weighted-average per share prices	$ 25.40

Employee Pension Plans (Compone

Employee Pension Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of net periodic benefit cost
Interest cost	$ 883	$ 975
Expected return on plan assets	(1,077)	(1,088)
Amortization of net loss	513	456
Other	213	213
Net periodic benefit cost	532	556
Company contribution	800	$ 800
Expected contributions remainder of current fiscal year	$ 2,000

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 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 three months ended March 31, 2018 or 2017.	The Company did not have material transfers between Levels 1 and 2 during the three months ended March 31, 2018 or 2017.
Transfers between Levels 1 and 2, amount	$ 0	$ 0
Convertible Notes [Member]
Long-term Debt
Long-term debt, fair value	210,200,000		$ 222,200,000
2017 Senior Notes [Member] | Senior Notes [Member]
Long-term Debt
Long-term debt, fair value	515,000,000		537,500,000
Significant Other Observable Inputs (Level 2) [Member]
Long-term Debt
Restricted investments, fair value	$ 52,500,000		$ 52,500,000

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Restricted cash	$ 4,090	$ 4,780
Fair Value Measured On A Recurring Basis [Member]
Assets:
Cash and cash equivalents	174,340	192,868
Restricted cash	4,090	4,780
Investments in lieu of retainage	67,809	72,296
Total assets	246,239	269,944
Fair Value Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Cash and cash equivalents	174,340	192,868
Restricted cash	4,090	4,780
Investments in lieu of retainage	65,708	69,891
Total assets	244,138	267,539
Fair Value Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Investments in lieu of retainage	2,101	2,405
Total assets	$ 2,101	$ 2,405

Variable Interest Entities (V55

Variable Interest Entities (VIE) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets, Current	$ 3,112,500		$ 3,074,392
Liabilities, Current	1,559,438		1,581,846
REVENUE	1,028,156	$ 1,117,361
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current	130,800		95,500
Assets, Noncurrent	25,100		11,600
Liabilities, Current	$ 211,000		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	2,400		800
Liabilities, Current	$ 2,400		$ 800

Other Comprehensive Income (L56

Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 532	$ 455
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(151)	(187)
Defined benefit pension plan adjustments, Net-of-Tax Amount	381	268
Foreign currency translation adjustments, Before-Tax Amount	(1,638)	(92)
Foreign currency translation adjustments, Tax (Expense) Benefit	464	38
Foreign currency translation adjustments, Net-of-Tax Amount	(1,174)	(54)
Unrealized (loss) gain in fair value of investments, Before-Tax Amount	(119)	(36)
Unrealized (loss) gain in fair value of investments, Tax (Expense) Benefit	34	15
Unrealized (loss) gain in fair value of investments, Net-of-Tax Amount	(85)	(21)
Total other comprehensive income (loss), Before-Tax Amount	(1,225)	327
Total other comprehensive income (loss), Tax (Expense) Benefit	347	(134)
Total other comprehensive income (loss), Net-of-Tax Amount	(878)	193
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	(1,225)	327
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	347	(134)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ (878)	$ 193

Other Comprehensive Income (L57

Other Comprehensive Income (Loss) (Schedule Of Changes In AOCI Balances By Component (After-Tax)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 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	(878)	$ 193
Balance at the end of the period	1,699,680
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	(39,441)	(40,865)
Amounts reclassified from AOCI	381	268
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	381	268
Balance at the end of the period	(39,060)	(40,597)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	(3,591)	(4,864)
Other comprehensive loss before reclassifications	(1,174)	(54)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1,174)	(54)
Balance at the end of the period	(4,765)	(4,918)
Unrealized Gain in Fair Value of Investments, net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	314	316
Other comprehensive loss before reclassifications	(85)	(21)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(85)	(21)
Balance at the end of the period	229	295
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period	(42,718)	(45,413)
Other comprehensive loss before reclassifications	(1,259)	(75)
Amounts reclassified from AOCI	381	268
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(878)	193
Balance at the end of the period	$ (43,596)	$ (45,220)

Business Segments (Narrative) (

Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)segment$ / shares	Mar. 31, 2017USD ($)$ / shares
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Income from construction operations	$ (925)	$ 37,017
After-tax impact	$ (10,942)	$ 13,764
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share) | $ / shares	$ (0.24)	$ 0.27
Building [Member]
Segment Reporting Information [Line Items]
Income from construction operations	$ 6,425	$ 5,242
Civil [Member]
Segment Reporting Information [Line Items]
Income from construction operations	2,839	31,888
Civil [Member] | Scenario Unfavorable Adjustment [Member]
Segment Reporting Information [Line Items]
Income from construction operations	17,800
After-tax impact	$ 12,700
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share) | $ / shares	$ 0.25
Specialty Contractors [Member]
Segment Reporting Information [Line Items]
Income from construction operations	$ 7,235	14,762
Corporate [Member]
Segment Reporting Information [Line Items]
Income from construction operations	$ (17,424)	$ (14,875)

Business Segments (Reportable S

Business Segments (Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Segments [Line items]
Revenue	$ 1,028,156	$ 1,117,361
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	(925)	37,017
Capital expenditures	19,970	5,672
Depreciation and amortization	10,187	20,996
External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	1,090,818	1,169,055
Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(62,662)	(51,694)
Reportable Segments [Member]
Business Segments [Line items]
Revenue	1,028,156	1,117,361
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	16,499	51,892
Capital expenditures	19,893	5,618
Depreciation and amortization	7,349	18,028
Reportable Segments [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	1,090,818	1,169,055
Reportable Segments [Member] | Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(62,662)	(51,694)
Civil [Member]
Business Segments [Line items]
Revenue	263,114	304,575
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	2,839	31,888
Capital expenditures	19,196	5,567
Depreciation and amortization	5,756	16,318
Civil [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	325,400	338,108
Civil [Member] | Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(62,286)	(33,533)
Building [Member]
Business Segments [Line items]
Revenue	490,241	497,090
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	6,425	5,242
Capital expenditures	278	45
Depreciation and amortization	481	518
Building [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	490,617	515,251
Building [Member] | Elimination Of Intersegment Revenues [Member]
Business Segments [Line items]
Revenue	(376)	(18,161)
Specialty Contractors [Member]
Business Segments [Line items]
Revenue	274,801	315,696
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	7,235	14,762
Capital expenditures	419	6
Depreciation and amortization	1,112	1,192
Specialty Contractors [Member] | External And Intersegment Customers [Member]
Business Segments [Line items]
Revenue	274,801	315,696
Corporate [Member]
Business Segments [Line items]
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	(17,424)	(14,875)
Capital expenditures	77	54
Depreciation and amortization	$ 2,838	$ 2,968

Business Segments (Reconciliati

Business Segments (Reconciliation of Segment Results to Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Segments [Abstract]
Income (loss) from construction operations	$ (925)	$ 37,017
Other income, net	780	417
Interest expense	(15,065)	(15,564)
INCOME (LOSS) BEFORE INCOME TAXES	$ (15,210)	$ 21,870

Business Segments (Schedule of

Business Segments (Schedule of Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Reportable segment information
Total Assets	$ 4,308,129	$ 4,264,123
Civil [Member]
Reportable segment information
Total Assets	2,404,703	2,452,108
Building [Member]
Reportable segment information
Total Assets	926,789	909,207
Specialty Contractors [Member]
Reportable segment information
Total Assets	763,933	767,807
Corporate and Other [Member]
Reportable segment information
Total Assets	$ 212,704	$ 135,001

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details) - O&G [Member]	3 Months Ended
	Mar. 31, 2018agreement
Completed Infrastructure Projects [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Number of joint ventures	2
Purple Line Segment 2 Expansion Project [Member]
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%

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income from construction operations	$ (925)	$ 37,017
Civil [Member]
Income from construction operations	2,839	$ 31,888
Scenario Unfavorable Adjustment [Member] | Civil [Member]
Income from construction operations	$ 17,800