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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash payments related to share-based compensation | $ 11,769 | $ 584 | $ 808 |
Cash payments related to share-based compensation | $ (11,769) | (584) | (808) |
Weighted average remaining contractual term of outstanding stock options | 3 years 3 months 18 days |  |  |
Number of vested and exercisable stock options (in shares) | 1,988,034 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ 12,800 |  |  |
Vested and exercisable stock options, weighted average exercise price (in dollars per share) | $ 19.31 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | 3 years 3 months 18 days |  |  |
Share-based compensation expense | $ 21,174 | 13,423 | 9,477 |
Share based compensation, tax benefits | 8,700 | 6,100 | 4,600 |
Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 19,600 | 13,400 | 9,500 |
Non-employee Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 1,600 | 1,400 | $ 1,500 |
Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for future grant (in shares) | 214,000 |  |  |
Units forfeited | 20,985 |  | 281,560 |
Expired or forfeited/cancelled, Weighted Average Grant Date Fair Value (in dollars per share) | $ 23.91 |  | $ 23.89 |
Fair value of restricted stock units that vested during period | $ 25,300 | 1,000 | $ 8,000 |
Aggregate intrinsic value | 1,300 | 1,100 |  |
Restricted stock expense | $ 22,500 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 7 months 6 days |  |  |
Share based compensation, tax benefits | $ 600 | $ 500 |  |
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ 30.02 | $ 19.14 | $ 23.07 |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for future grant (in shares) | 194,000 |  |  |
Options forfeited, Weighted Average Exercise Price | $ 26.56 |  | $ 15.97 |
Stock option expense | $ 3,700 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 2 months 12 days |  |  |
Total granted and outstanding (in shares) | 2,554,034 | 2,174,500 | 1,998,000 | 1,989,000
Intrinsic value of outstanding stock options | $ 13,600 |  |  |
Weighted average remaining contractual term of outstanding stock options | 4 years 4 months 24 days |  |  |
Stock options granted but not vested | 566,000 |  |  |
Stock options granted and expected to vest | 527,816 |  |  |
Stock options granted, intrinsic value | $ 700 |  |  |
Stock options granted, weighted-average exercise price | $ 24.27 |  |  |
Stock options granted, weighted-average remaining contractual life | 8 years 2 months 12 days |  |  |
Granted, Grant Date Fair Value (in dollars per share) | $ 13.11 | $ 5.31 | $ 12.48 |
Granted (in shares) | 539,000 | 274,000 | 259,000 |
Unrestricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of unrestricted stock units issued | $ 2,600 | $ 1,400 | $ 1,500 |
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ 26.26 | $ 21.67 | $ 21.93 |
Compensation Plan And Incentive Plan ("Plans") [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash payments related to share-based compensation | $ 600 |  |  |
Cash payments related to share-based compensation | $ (600) |  |  |
Tutor Perini Corporation Incentive Compensation Plan (“Compensation Plan”) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for future grant (in shares) | 1,554,364 |  |  |
Tutor Perini Corporation Incentive Compensation Plan (“Compensation Plan”) [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options expiration period | 10 years |  |  |
Number of shares authorized for grant | 2,335,000 |  |  |
Amended and Restated Tutor Perini Corporation Long-Term Incentive Plan (“Incentive Plan”) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for future grant (in shares) | 405,529 |  |  |
Amended and Restated Tutor Perini Corporation Long-Term Incentive Plan (“Incentive Plan”) | Restricted Stock Units And Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate number of shares outstanding, historical awards that either have not vested or have vested but not exercised | 4,360,018 |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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