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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 3 Months Ended
Mar. 31, 2013
Accounts receivable
  
Concentration Risk [Line Items]  
Schedules of concentration of risk, by risk factor
The table below presents the concentrations of receivables (trade and retainage) at March 31, 2013 and December 31, 2012, respectively:

 
March 31, 2013
 
December 31, 2012
Federal Government
$
11,794

31
%
 
$
7,375

14
%
State Governments
194

1
%
 
1,761

3
%
Local Governments
6,924

17
%
 
5,532

10
%
Private Companies
19,415

51
%
 
38,617

73
%
Total receivables
$
38,327

100
%
 
$
53,285

100
%
Contract revenues
  
Concentration Risk [Line Items]  
Schedules of concentration of risk, by risk factor
Additionally, the table below represents concentrations of revenue by type of customer for the three months ended March 31, 2013, and 2012.
 
Three months ended March 31,
 
 
 
2013
 
%
 
2012
 
%
 
 
Federal
$
20,031

 
27
%
 
$
12,716

 
25
%
 
 
State
6,219

 
8
%
 
7,520

 
15
%
 
 
Local
17,234

 
23
%
 
11,116

 
22
%
 
 
Private
31,575

 
42
%
 
19,538

 
38
%
 
 
 
$
75,059

 
100
%
 
$
50,890

 
100
%