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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment $ / shares | Mar. 31, 2016 USD ($) contract $ / shares
Segment Reporting Information [Line Items] |  |
Number of reportable segments | segment | 3 |
Income from construction operations | $ 37,017 | $ 40,122
Net income | $ 13,764 | $ 15,400
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares | $ 0.27 | $ 0.31
Depreciation and amortization | $ 20,996 | $ 14,496
Tutor Perini Corporation [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | 185 | 778
Net income | 13,764 | 15,400
Depreciation and amortization | 11,975 | 5,626
Building [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | 5,242 | 12,450
Civil [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | 31,888 | 33,665
Specialty Contractors [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | 14,762 | 9,413
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | $ (14,875) | (15,406)
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
Five Star Electric Subcontract [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of projects | contract |  | 2
Five Star Electric Subcontract [Member] | Scenario Unfavorable Adjustment [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 Subcontract [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

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