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Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Use of Estimates        
Contract estimate writedown $ 2,200,000   $ 4,400,000  
Cash paid for:        
Interest 197,000 269,000 1,081,000 789,000
Income taxes 307,000 1,928,000 1,231,000 5,051,000
Total 504,000 2,197,000 2,312,000 5,840,000
Income Taxes        
Tax expense $ 4,649,000 $ 6,588,000 $ 9,087,000 $ 14,366,000
Effective tax rate (as a percent)     35.10% 38.80%
Federal statutory income taxes rate (as a percent)     35.00% 35.00%
State income taxes rate (as a percent)     4.20% 3.80%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation and Amortization, Percent     1.70%  
Noncontrolling interest (as a percent)     (4.50%)