XML 49 R34.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Fair Value Measurements (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Fair Values of Financial Instruments and Nonfinancial Assets and Liabilities Measured at the Reporting Date | The fair values of these financial instruments are summarized as follows:
|  |  |  | Fair Value at |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |
|  | Hierarchy |  | December 31, 2024 |  |  | December 31, 2023 |
|  | Levels |  | Assets |  |  | Liabilities |  |  | Assets |  |  | Liabilities |
Derivatives designated as cash flow hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts |  | 2 |  | $ | — |  |  | $ | 1,065 |  |  | $ | — |  |  | $ | 2,918 |
Foreign currency exchange hedge contracts |  | 2 |  |  | — |  |  |  | — |  |  |  | 358 |  |  |  | — |
Interest rate swaps |  | 2 |  |  | 217 |  |  |  | — |  |  |  | — |  |  |  | — |
Total derivatives |  |  |  | $ | 217 |  |  | $ | 1,065 |  |  | $ | 358 |  |  | $ | 2,918 |
Changes in Components of Accumulated Other Comprehensive Income (Loss) | Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows:
|  | 2024 |  |  | 2023 |  |  | 2022 |
Derivatives: |  |  |  |  |  |  |  |  |
Fuel Hedge Contracts |  |  |  |  |  |  |  |  |
Reclassification of derivative losses (gains) to earnings—net of tax |  | $ | 1,593 |  |  | $ | 861 |  |  | $ | (10,629 | )
Change in fair value of derivatives—net of tax |  |  | (208 | ) |  |  | (2,565 | ) |  |  | 9,681 |
Net change in cash flow derivative fuel hedges—net of tax |  | $ | 1,385 |  |  | $ | (1,704 | ) |  | $ | (948 | )
Foreign Currency Exchange Hedge Contracts |  |  |  |  |  |  |  |  |
Reclassification of derivative losses (gains) to earnings—net of tax |  | $ | 208 |  |  | $ | (400 | ) |  | $ | 116 |
Change in fair value of derivatives—net of tax |  |  | (705 | ) |  |  | 280 |  |  |  | 501 |
Net change in cash flow derivative foreign currency hedges—net of tax |  | $ | (497 | ) |  | $ | (120 | ) |  | $ | 617 |
Interest Rate Swaps |  |  |  |  |  |  |  |  |
Reclassification of derivative gains to earnings—net of tax |  | $ | (233 | ) |  | $ | — |  |  | $ | — |
Change in fair value of derivatives—net of tax |  |  | 395 |  |  |  | — |  |  |  | — |
Net change in cash flow derivative foreign currency hedges—net of tax |  | $ | 162 |  |  | $ | — |  |  | $ | — |
Total net change in cash flow derivative hedges - net of tax |  | $ | 1,050 |  |  | $ | (1,824 | ) |  | $ | (331 | )
Adjustments Reclassified from Accumulated Balances Other Comprehensive Income (Loss) to Earnings | Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows:
|  | Statement of Operations Location |  | 2024 |  |  | 2023 |  |  | 2022 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts |  | Costs of contract revenues |  | $ | 2,132 |  |  | $ | 1,152 |  |  | $ | (14,219 | )
Foreign currency exchange hedge contracts |  | Other income (expense) |  |  | 278 |  |  |  | — |  |  |  | — |
Interest rate swaps |  | Interest expense—net |  |  | (312 | ) |  |  | — |  |  |  | — |
|  | Income tax (provision) benefit |  |  | 530 |  |  |  | 291 |  |  |  | (3,590 | )
|  |  |  | $ | 1,568 |  |  | $ | 861 |  |  | $ | (10,629 | )

X
- Definition Schedule of fair values of financial instruments and non-financial assets and liabilities measured. + References No definition available. + Details
Name: | gldd_ScheduleOfFairValuesOfFinancialInstrumentsAndNonfinancialAssetsAndLiabilitiesMeasuredTableTextBlock
Namespace Prefix: | gldd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration