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Summary of Significant Accounting Policies (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nov. 30, 2011
General matters          
Minimum liquidation period of assets in which significant working capital has been invested 1 year        
Foreign operations          
Assets in Canada $ 10,335,000 $ 9,385,000      
Functional currencies and foreign currency translation          
Foreign exchange gain (loss) (36,000) (96,000) 250,000    
Partnerships and joint ventures          
Number of VIE whose financial results are consolidated 1        
Cash concentration          
Cash balances 157,551,000 120,306,000 115,437,000 90,004,000  
Short term CDARS   28,000,000      
Treasury bill funds 4,600,000 4,600,000      
Cash balances with various financial institutions that are backed by the federal government FDIC program 153,000,000 87,700,000      
Collective bargaining agreements          
Percentage of labor force subject to collective bargaining agreements 37.00%        
Number of collective bargaining agreements 72        
Number of collective bargaining agreements requiring renegotiation during the year 19        
Multiemployer Plans          
Withdrawal liability recorded 7,500,000 5,000,000     7,500,000
Expense recorded as a result of increase in withdrawal liability 2,500,000        
Worker's compensation insurance          
Self insurance reserve 16,547,000 13,809,000      
Accounts receivable          
Allowance for doubtful accounts 432,000 363,000      
Other contract forms          
Provision for estimated loss on uncompleted contracts 764,000 917,000      
Significant revisions in contract estimates          
Increase in gross profit earned, if revised estimates had been applied in prior year   $ 8,185,000 $ 10,244,000 $ 9,892,000  
Increase in per diluted share, if revised estimates had been applied in prior year   $ 0.10 $ 0.12 $ 0.13