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Revenue (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Summary of Type of Work and Customer, Contract Revenues

The following table sets forth, by type of work, the Company’s contract revenues for the years ended December 31, 2023, 2022 and 2021:

Revenues		2023				2022				2021
Dredging:
Capital—U.S.		$	186,715			$	342,461			$	397,034
Capital—foreign			—				149				6,596
Coastal protection			196,343				192,567				169,678
Maintenance			187,586				98,077				132,551
Rivers & lakes			16,318				15,527				20,290
Total dredging revenues		$	586,962			$	648,781			$	726,149
Offshore Wind:
Offshore Wind			2,663				—				—
Total revenues		$	589,625			$	648,781			$	726,149

The following table sets forth, by type of customer, the Company’s contract revenues for the years ended December 31, 2023, 2022 and 2021:

Revenues		2023				2022				2021
Dredging:
Federal government		$	438,790			$	431,705			$	568,980
State and local government			129,583				207,033				118,712
Private			18,589				9,894				31,861
Foreign			—				149				6,596
Total dredging revenues		$	586,962			$	648,781			$	726,149
Offshore wind:
Offshore wind			2,663				—				—
Total revenues		$	589,625			$	648,781			$	726,149

Schedule of Accounts Receivable

Accounts receivable at December 31, 2023 and December 31, 2022 are as follows:

		2023				2022
Completed contracts		$	2,920			$	4,682
Contracts in progress			40,743				32,546
Retainage			11,511				8,226
			55,174				45,454
Allowance for doubtful accounts			(364	)			(564	)
Total accounts receivable—net		$	54,810			$	44,890

Components of Contracts in Progress

The components of contracts in progress at December 31, 2023 and December 31, 2022 are as follows:

		2023				2022
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress		$	206,330			$	262,125
Amounts billed			(196,520	)			(210,068	)
Costs and earnings in excess of billings for contracts in progress			9,810				52,057
Costs and earnings in excess of billings for completed contracts			58,925				14,972
Total contract revenues in excess of billings		$	68,735			$	67,029
Current portion of contract revenues in excess of billings		$	68,735			$	65,922
Long-term contract revenues in excess of billings			—				1,107
Total contract revenues in excess of billings		$	68,735			$	67,029
Billings in excess of costs and earnings:
Amounts billed		$	(258,948	)		$	(95,013	)
Costs and earnings for contracts in progress			229,388				85,099
Total billings in excess of contract revenues		$	(29,560	)		$	(9,914	)

Summary of Revenues and Gross Profit from Foreign Project Operations

The Company derived revenues and gross loss from foreign project operations for the years ended December 31, 2023, 2022, and 2021, as follows:

		2023				2022				2021
Contract revenues		$	—			$	149			$	6,596
Costs of contract revenues			(1,142	)			(341	)			(9,281	)
Gross loss		$	(1,142	)		$	(192	)		$	(2,685	)

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