XML 42 R34.htm IDEA: XBRL DOCUMENT v3.24.1.u1

Revenue (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenue From Contract With Customer [Line Items]
Revenue, remaining performance obligation	$ 879,400
Performance obligations exclude from dredging backlog	44,600
Performance obligations domestic low bids pending formal award and additional phases	$ 203,000
Percentage of performance obligation to be recognized as revenue	45.00%
Performance obligation, expected to be recognized as revenue year	2024
Remaining performance obligation, expected timing of satisfaction, year	2025 2026
Amortization on pre-construction costs	$ 4,419	$ 3,666
Options pending award related to offshore wind contracts	12,700
Other Current and Noncurrent Assets [Member]
Revenue From Contract With Customer [Line Items]
Costs to fulfill a contract with customer recognized as an asset	$ 21,718		$ 22,166

X

- Definition

Options pending award offshore wind contracts.

+ References

No definition available.

+ Details

Name:	gldd_OptionsPendingAwardOffshoreWindContracts
Namespace Prefix:	gldd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of performance obligation to be recognized as revenue.

+ References

No definition available.

+ Details

Name:	gldd_PercentageOfPerformanceObligationToBeRecognizedAsRevenue
Namespace Prefix:	gldd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Performance obligation expected to be recognized as revenue, year.

+ References

No definition available.

+ Details

Name:	gldd_PerformanceObligationExpectedToBeRecognizedAsRevenueYear
Namespace Prefix:	gldd_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Performance obligations domestic low bids pending formal award and additional phases.

+ References

No definition available.

+ Details

Name:	gldd_PerformanceObligationsDomesticLowBidsPendingFormalAwardAndAdditionalPhases
Namespace Prefix:	gldd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Performance obligations exclude from dredging backlog.

+ References

No definition available.

+ Details

Name:	gldd_PerformanceObligationsExcludeFromDredgingBacklog
Namespace Prefix:	gldd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Revenue from contract with customer line items.

+ References

No definition available.

+ Details

Name:	gldd_RevenueFromContractWithCustomerLineItems
Namespace Prefix:	gldd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

+ Details

Name:	us-gaap_CapitalizedContractCostAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

+ Details

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

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Year in which remaining performance obligation is expected to be recognized, in YYYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionYear1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:gYearListItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=gldd_OtherCurrentAndNoncurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: