Concentration of Risk and Enterprise Wide Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Contract revenues	$ 81,258	$ 75,059
Contract revenues
Concentration Risk [Line Items]
Contract revenues	81,258
Customer concentration risk | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables			40,933	49,537
Concentration risk, percentage	100.00%	100.00%
Customer concentration risk | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%
Contract revenues		75,059
Customer concentration risk | U.S. Army Corps of Engineers | Trade and contract retainage receivables
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%
Customer concentration risk | U.S. Army Corps of Engineers | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage	13.80%	11.70%
Customer concentration risk | Private Sector Customer | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage	14.30%
Customer concentration risk | Second Private Sector Customer | Trade and contract retainage receivables
Concentration Risk [Line Items]
Concentration risk, percentage	12.10%	9.90%
Customer concentration risk | Local port authority [Member] | Trade and contract retainage receivables
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%
Customer concentration risk | Federal Government | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables			4,937	4,849
Concentration risk, percentage	12.00%	10.00%
Customer concentration risk | Federal Government | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	27.00%
Contract revenues	11,897	20,031
Customer concentration risk | State Governments | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables			1,741	4,002
Concentration risk, percentage	4.00%	8.00%
Customer concentration risk | State Governments | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage	8.00%	8.00%
Contract revenues	6,911	6,219
Customer concentration risk | Local Governments | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables			11,188	8,857
Concentration risk, percentage	27.00%	18.00%
Customer concentration risk | Local Governments | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%	23.00%
Contract revenues	13,505	17,234
Customer concentration risk | Private Companies | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables			23,067	31,829
Concentration risk, percentage	57.00%	64.00%
Customer concentration risk | Private Companies | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage	60.00%	42.00%
Contract revenues	$ 48,945	$ 31,575