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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2016 USD ($) segment $ / shares | Sep. 30, 2015 USD ($) $ / shares
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | segment |  |  |  | 3 |
Income from construction operations | $ 60,919 |  | $ 38,974 | $ 149,870 | $ 89,939
Net income | $ 28,801 |  | $ 19,677 | $ 65,561 | $ 36,580
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares | $ 0.57 |  | $ 0.40 | $ 1.32 | $ 0.74
Depreciation and amortization |  |  |  | $ 47,295 | $ 30,959
Tutor Perini Corporation [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations | $ 9,769 |  | $ 32,132 | 26,377 | 52,355
Net income | 28,801 |  | 19,677 | 65,561 | 36,580
Depreciation and amortization |  |  |  | 20,747 | 6,710
Building [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations | 13,296 |  | 6,763 | 38,969 | (8,107)
Depreciation and amortization | 500 |  | 600 | 1,600 | 2,100
Building [Member] | Scenario Unfavorable Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations |  |  |  |  | $ 21,400
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  |  |  |  | $ 0.25
Civil [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations | 50,307 |  | 43,183 | 129,028 | $ 120,106
Depreciation and amortization | 12,700 |  | 5,600 | 33,300 | 16,900
Civil [Member] | Scenario Unfavorable Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations |  |  | $ 23,900 |  |
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  |  | $ 0.28 |  |
Civil [Member] | Scenario Favorable Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations |  |  | $ 13,700 |  |
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  |  | $ 0.16 |  |
Specialty Contractors [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations | 11,084 |  | $ 4,741 | 25,910 | 29,008
Depreciation and amortization | 1,200 |  | 1,400 | 3,800 | 4,100
Specialty Contractors [Member] | Scenario Unfavorable Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations |  |  | $ 13,900 |  |
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  |  | $ 0.16 |  |
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations | (13,768) |  | $ (15,713) | (44,037) | (51,068)
Depreciation and amortization | $ 2,900 |  | $ 2,900 | $ 8,600 | $ 7,900
Completed Project [Member] | Scenario Favorable Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations |  | $ 14,000 |  |  |
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  | $ 0.17 |  |  |
Substatially Completed Project [Member] | Scenario Unfavorable Adjustment (b) [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations |  | $ 13,800 |  |  |
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  | $ 0.17 |  |  |
Five Star Electric [Member] | Specialty Contractors [Member] | Scenario Favorable Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from construction operations |  | $ 3,000 |  |  |
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  | $ 0.04 |  |  |

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