Receivables, Net (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	$ 247,865,000	$ 316,111,000	$ 263,230,000
Allowance for Accounts, Notes, Loans and Financing Receivable, Current	2,584,000	2,513,000	2,999,000
Receivables, net	245,281,000	313,598,000	260,231,000
Notes, Loans and Financing Receivable, Net, Noncurrent	1,200,000	1,300,000	1,800,000
Construction Contracts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	211,863,000	266,641,000	232,962,000
Completed and in Progress [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	142,289,000	193,538,000	145,511,000
Retentions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	69,574,000	73,103,000	87,451,000
Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	25,603,000	25,124,000	39,290,000
Non Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	43,971,000	47,979,000	48,161,000
Financing Receivable, Recorded Investment, Aging [Abstract]
Non-escrow retention receivable - current	35,341,000	39,284,000	36,795,000
Non-escrow retention receivable - 1 to 90 days past due	2,487,000	1,650,000	4,703,000
Non-escrow retention receivable - over 90 days past due	6,143,000	7,045,000	6,663,000
Construction Material Sales [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	23,790,000	36,813,000	20,782,000
Other Business Products and Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	12,212,000	12,657,000	9,486,000
Federal [Member] | Non Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	2,108,000	2,878,000	2,926,000
Financing Receivable, Recorded Investment, Aging [Abstract]
Non-escrow retention receivable - current	2,054,000	2,843,000	2,660,000
Non-escrow retention receivable - 1 to 90 days past due	36,000	13,000	156,000
Non-escrow retention receivable - over 90 days past due	18,000	22,000	110,000
State [Member] | Non Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	4,275,000	5,579,000	2,440,000
Financing Receivable, Recorded Investment, Aging [Abstract]
Non-escrow retention receivable - current	3,234,000	4,919,000	1,388,000
Non-escrow retention receivable - 1 to 90 days past due	438,000	326,000	397,000
Non-escrow retention receivable - over 90 days past due	603,000	334,000	655,000
Local [Member] | Non Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	28,587,000	31,122,000	30,991,000
Financing Receivable, Recorded Investment, Aging [Abstract]
Non-escrow retention receivable - current	22,744,000	24,705,000	23,003,000
Non-escrow retention receivable - 1 to 90 days past due	836,000	1,024,000	2,541,000
Non-escrow retention receivable - over 90 days past due	5,007,000	5,393,000	5,447,000
Private [Member] | Non Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, Gross, Current	9,001,000	8,400,000	11,804,000
Financing Receivable, Recorded Investment, Aging [Abstract]
Non-escrow retention receivable - current	7,309,000	6,817,000	9,744,000
Non-escrow retention receivable - 1 to 90 days past due	1,177,000	287,000	1,609,000
Non-escrow retention receivable - over 90 days past due	$ 515,000	$ 1,296,000	$ 451,000