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Earnings Per Share - (Narrative) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2023 shares
Earnings Per Share [Abstract]
Stock options and restricted stock units excluded from weighted-average common shares outstanding	246

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- Definition

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

+ References

No definition available.

+ Details

Name:	gldd_AntidilutiveSecuritiesExcludedFromDilutedWeightedAverageCommonSharesOutstanding
Namespace Prefix:	gldd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration