Property and Equipment (Details) (USD $)	12 Months Ended																			1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended
	Dec. 31, 2013 acre	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Land	Dec. 31, 2012 Land	Dec. 31, 2013 Depreciable Assets [Member]	Dec. 31, 2012 Depreciable Assets [Member]	Dec. 31, 2013 Automobiles and trucks	Dec. 31, 2012 Automobiles and trucks	Dec. 31, 2013 Building and improvements	Dec. 31, 2012 Building and improvements	Dec. 31, 2013 Construction equipment	Dec. 31, 2012 Construction equipment	Dec. 31, 2013 Dredges and dredging equipment	Dec. 31, 2012 Dredges and dredging equipment	Dec. 31, 2013 Office equipment	Dec. 31, 2012 Office equipment	Dec. 31, 2013 Construction in progress	Dec. 31, 2012 Construction in progress	Jan. 31, 2013 Acquisition of Tampa Property from Lazarra buildings	Dec. 31, 2013 Acquisition of Tampa Property from Lazarra	Jan. 31, 2013 Acquisition of Tampa Property from Lazarra Land and Building [Member] acre	Oct. 31, 2013 Purchase of the assets of West Construction	Dec. 31, 2013 Maximum Acquisition of Tampa Property from Lazarra
Property, Plant and Equipment [Line Items]
Asset held for sale	$ 417,000	$ 920,000
Property, plant and equipment, gross				14,793,000	14,793,000	268,793,000	265,485,000	2,148,000	1,591,000	22,828,000	22,037,000	145,309,000	140,835,000	93,963,000	96,927,000	4,545,000	4,095,000	2,458,000	6,949,000
Less: accumulated depreciation						(144,121,000)	(136,556,000)
Property and equipment, net	141,923,000	150,671,000				124,672,000	128,929,000
Depreciation expense	21,100,000	21,500,000	19,400,000
Area of land purchased, including buildings and improvements	340																					18
Purchase price of significant acquisitions during period																						13,700,000	9,300,000
Commitment to make dock improvements, amount																				279,700
Lease of land, term																					20 years
Lease payments to be made in advance, due in next 12 months																				250,000
Leaseback to seller, number of buildings leased																				3
Leaseback to seller, maximum period																								24 months
Rent abatement term																					12 months
Fixed assets increase due to acquisition																							4,500,000
Impairment loss on assets held-for-sale	2,000,000
Proceeds from Sale of Productive Assets	$ 500,000