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Organization and Summary of Significant Accounting Policies (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) vessel $ / shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 $ / shares | Dec. 31, 2017 USD ($) vessel segment $ / shares | Dec. 31, 2016 USD ($) segment $ / shares | Dec. 31, 2015 USD ($) segment $ / shares
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of technologically advanced offshore support vessels being constructed | vessel | 1 |  |  |  |  |  |  |  | 1 |  |
Number of multi-purpose service vessels being constructed | vessel | 2 |  |  |  |  |  |  |  | 2 |  |
Workers compensation liability | $ 4,100,000 |  |  |  | $ 3,400,000 |  |  |  | $ 4,100,000 | $ 3,400,000 |
Unapproved change order and claim revenue |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
Valuation allowance | $ 392,000 |  |  |  | $ 0 |  |  |  | 392,000 | 0 |
Payments made on behalf of employees from withheld, vested shares of common stock |  |  |  |  |  |  |  |  | $ 916,000 | $ 217,000 | $ 79,000
Number of operating divisions | segment |  |  |  |  |  |  |  |  | 3 | 3 | 3
Income tax expense |  |  |  |  |  |  |  |  | $ (24,193,000) | $ 2,041,000 | $ (13,369,000)
Loss per share (in dollars per share) | $ / shares | $ (1.63) | $ (0.21) | $ (0.73) | $ (0.44) | $ (0.24) | $ 0.04 | $ 0.37 | $ 0.07 | $ (3.02) | $ 0.24 | $ (1.75)
Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of property, plant and equipment |  |  |  |  |  |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of property, plant and equipment |  |  |  |  |  |  |  |  | 25 years |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | $ 253,000 |  |
Loss per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.02 |  |

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