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Goodwill (Tables)
12 Months Ended
Dec. 31, 2011
Goodwill Disclosure [Abstract]  
Schedule of goodwill by reporting segment
The changes in the carrying amount of goodwill by reporting segment during the years ended December 31, 2011 and 2010 are as follows (in thousands):
 
   
Asphalt Group
  
Aggregate and Mining Group
  
Mobile
Asphalt Paving Group
  
Underground Group
  
 
Other
  
 
Total
 
Balance, December 31, 2009
 $5,922  $6,339  $1,646  $--  $--  $13,907 
                         
Balance, December 31, 2010
  5,922   6,339   1,646   --   --   13,907 
Business acquisition
  --   --   1,171   --   --   1,171 
Foreign currency translation
  --   --   (89)  --   --   (89)
Balance, December 31, 2011
 $5,922  $6,339  $2,728  $--  $--  $14,989