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Concentration of Risk and Enterprise Wide Disclosures (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2013 and December 31, 2012, respectively:

 
September 30, 2013
 
December 31, 2012
Federal Government
$
4,294

8
%
 
$
7,375

14
%
State Governments
4,759

9
%
 
1,761

3
%
Local Governments
8,442

16
%
 
5,532

10
%
Private Companies
35,897

67
%
 
38,617

73
%
Total receivables
$
53,392

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 and nine months ended September 30, 2013, and 2012.
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
%
 
2012
 
%
 
2013
 
%
 
2012
 
%
Federal
$
14,193

 
16
%
 
$
17,408

 
23
%
 
$
50,685

 
20
%
 
$
42,336

 
22
%
State
9,339

 
10
%
 
11,623

 
15
%
 
21,355

 
9
%
 
28,637

 
15
%
Local
12,359

 
14
%
 
7,463

 
10
%
 
38,545

 
16
%
 
32,057

 
16
%
Private
53,101

 
60
%
 
38,892

 
52
%
 
137,546

 
55
%
 
90,378

 
47
%
 
$
88,992

 
100
%
 
$
75,386

 
100
%
 
$
248,131

 
100
%
 
$
193,408

 
100
%