XML 37 R23.htm IDEA: XBRL DOCUMENT
v3.22.4

Nature of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Estimated Useful Lives By Class Of Assets | The estimated useful lives by class of assets are:
Class |  | Useful Life (years)
Buildings and improvements |  | 10
Furniture and fixtures |  | 5-10
Vehicles, dozers, and other light operating equipment and systems |  | 3-5
Heavy operating equipment (dredges and barges) |  | 10-30

X
- Definition Estimated useful lives by class of assets. + References No definition available. + Details
Name: | gldd_EstimatedUsefulLivesByClassOfAssetsTableTextBlock
Namespace Prefix: | gldd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration