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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Sep. 30, 2014 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Mar. 31, 2014 USD ($) $ / shares | Dec. 31, 2015 USD ($) segment $ / shares | Dec. 31, 2014 USD ($) item $ / shares | Dec. 31, 2013 USD ($) $ / shares
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of basic segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Income from construction operations | $ 15,474 | $ 38,974 | $ 30,881 | $ 20,084 | $ 64,396 | $ 70,354 | $ 65,443 | $ 41,497 | $ 105,413 | $ 241,690 | $ 203,822
DILUTED EARNINGS PER COMMON SHARE | $ / shares | $ 0.18 | $ 0.40 | $ 0.24 | $ 0.10 | $ 0.56 | $ 0.73 | $ 0.58 | $ 0.33 | $ 0.91 | $ 2.20 | $ 1.80
Tutor Perini Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ 68,595 | $ 70,574 | $ 12,258
Building [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of projects | item |  |  |  |  |  |  |  |  |  | 1 |
Income from construction operations |  |  |  |  |  |  |  |  | (1,240) | $ 24,697 | 24,579
Building [Member] | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ (24,300) |  |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  | $ (0.28) |  |
Building [Member] | Favorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  | $ 11,400 | $ 13,800
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.14 | $ 0.18
Civil [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of projects | item |  |  |  |  |  |  |  |  |  | 2 |
Income from construction operations |  |  |  |  |  |  |  |  | $ 145,213 | $ 220,554 | $ 177,667
Civil [Member] | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  | $ (9,400) |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  | $ (0.11) |
Civil [Member] | Favorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ 13,700 | $ 25,900 |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  | $ 0.16 | $ 0.30 |
Specialty Contractors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ 15,682 | $ 50,998 | $ 49,008
Five Star Electric [Member] | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ (45,600) |  |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  | $ (0.53) |  |
Brightwater Matter [Member] | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ (23,900) |  |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  | $ (0.28) |  |

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