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Earnings Per Share - (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Stock options and restricted stock units excluded from weighted-average common shares outstanding	462
Stock options and restricted stock, excluded from computation of earnings per share	351,000	1,000	1,000

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- Definition

Antidilutive securities excluded from diluted weighted-average common shares outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	gldd_
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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

+ Details

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Period Type:	duration

X

- References

No definition available.

+ Details

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