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Revenue Recognition - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |  |
Revenue | $ 54,014,000 |  | $ 45,868,000 | $ 111,304,000 | $ 83,860,000
Contracts in progress | 36,471,000 | $ 28,373,000 |  | 36,471,000 |
Advance billings on contracts | 4,165,000 | 5,136,000 |  | 4,165,000 |
Accrued contract losses | 5,999,000 | 7,618,000 |  | 5,999,000 |
Costs in Excess of Billings | Customer Concentration Risk | Three Major Customers |  |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |  |
Contracts in progress | 31,100,000 |  |  | 31,100,000 |
Billings in Excess of Costs | Customer Concentration Risk | Five Major Customers |  |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |  |
Customer advances | 3,500,000 |  |  | 3,500,000 |
Project, Approved Scope, Unapproved Price |  |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |  |
Revenue | 0 |  | 0 | 0 | 0
Shipyards |  |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |  |
Revenue | $ 23,620,000 |  | $ 18,303,000 | $ 42,185,000 | $ 36,724,000
Reduction to estimated contract price |  | $ 11,700,000 |  |  |

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. + References No definition available. + Details
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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15a) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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