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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 59,974 | $ 80,456 | $ 138,529 | $ 148,061
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (520) | (250) | (967) | (649)
Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 33,888 | 40,053 | 79,447 | 77,464
F&S |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 26,606 | 40,653 | 60,049 | 71,246
Fixed-price and unit-rate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 54,127 | 68,458 | 122,901 | 120,332
Fixed-price and unit-rate | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (239) | (105) | (324) | (178)
Fixed-price and unit-rate | Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 33,513 | 39,093 | 77,815 | 73,543
Fixed-price and unit-rate | F&S |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 20,853 | 29,470 | 45,410 | 46,967
T&M |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,830 | 9,147 | 13,012 | 22,730
T&M | Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 375 | 960 | 1,632 | 3,921
T&M | F&S |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,455 | 8,187 | 11,380 | 18,809
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,017 | 2,851 | 2,616 | 4,999
Other | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (281) | (145) | (643) | (471)
Other | F&S |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,298 | $ 2,996 | $ 3,259 | $ 5,470

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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