Contracts in Progress - Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) project	Dec. 31, 2019 USD ($)
Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts
Unbilled contract claims and change orders
Claims and unapproved change orders	$ 1.1	$ 0.1
Marine
Disaggregation of Revenue [Line Items]
Number of construction projects with unfavorable changes in estimates \| project	2
Decrease in revenue	$ 22.8

Amount of cost incurred on construction contract for unapproved change order, claim, or similar item subject to uncertainty.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6471471&loc=d3e48698-109348

Name:	us-gaap_UnapprovedChangeOrdersAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant