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Summary of Significant Accounting Policies - Depreciable Lives of Property and Equipment (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]                      
Depreciation expense                 $ 23,500,000us-gaap_Depreciation $ 21,100,000us-gaap_Depreciation $ 21,500,000us-gaap_Depreciation
Net income (loss) 5,288,000us-gaap_NetIncomeLoss 2,962,000us-gaap_NetIncomeLoss (1,163,000)us-gaap_NetIncomeLoss (210,000)us-gaap_NetIncomeLoss 2,134,000us-gaap_NetIncomeLoss (943,000)us-gaap_NetIncomeLoss 230,000us-gaap_NetIncomeLoss (1,090,000)us-gaap_NetIncomeLoss 6,877,000us-gaap_NetIncomeLoss 331,000us-gaap_NetIncomeLoss (11,866,000)us-gaap_NetIncomeLoss
Diluted (in dollars per share) $ 0.19us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ (0.03)us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted $ (0.44)us-gaap_EarningsPerShareDiluted
Proceeds from sale of productive assets                 500,000us-gaap_ProceedsFromSaleOfProductiveAssets    
Equipment improvement | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 3 years    
Equipment improvement | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 7 years    
Automobiles and trucks | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 3 years    
Automobiles and trucks | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 5 years    
Building and improvements | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 5 years    
Building and improvements | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 30 years    
Construction equipment | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 3 years    
Construction equipment | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 15 years    
Dredges and dredging equipment                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 3 years 5 years  
Dredges and dredging equipment | Service Life                      
Property, Plant and Equipment [Line Items]                      
Depreciation expense                 700,000us-gaap_Depreciation
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MarineServicesEquipmentMember		    
Net income (loss)                 $ (500,000)us-gaap_NetIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MarineServicesEquipmentMember		    
Diluted (in dollars per share)                 $ (0.02)us-gaap_EarningsPerShareDiluted
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MarineServicesEquipmentMember		    
Dredges and dredging equipment | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 1 year    
Dredges and dredging equipment | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 15 years    
Office equipment | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 1 year    
Office equipment | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 5 years    
Dry-docking capitalized costs | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 3 years    
Dry-docking capitalized costs | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property and equipment useful life                 15 years