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Note 16 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 16 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items]      
FIP/RP Status Pending/ Implemented Total Contributions: [1]    
Contributions $ 6,435,000 $ 5,541,000 $ 2,542,000
Pension Trust Fund for Operating Engineers Pension Plan [Member]
      
Note 16 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items]      
Certified Zone Status Red [2] Orange [2]  
FIP/RP Status Pending/ Implemented Yes [1]    
Contributions 1,654,000 508,000 246,000
Surcharge Imposed No    
Expiration Date of Collective Bargaining Agreement Jun. 30, 2014 [3]    
Carpenter Funds Administrative Office [Member]
      
Note 16 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items]      
Certified Zone Status Red [2] Red [2]  
FIP/RP Status Pending/ Implemented Yes [1]    
Contributions 759,000 47,000  
Surcharge Imposed No    
Expiration Date of Collective Bargaining Agreement Jun. 30, 2014 [3]    
Laborers Pension Trust for Northern California [Member]
      
Note 16 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items]      
Certified Zone Status Yellow [2] Yellow [2]  
FIP/RP Status Pending/ Implemented Yes [1]    
Contributions 897,000 431,000 64,000
Surcharge Imposed No    
Expiration Date of Collective Bargaining Agreement Jun. 30, 2014 [3]    
Cement Mason Pension Trust Fund For Northern California [Member]
      
Note 16 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items]      
Certified Zone Status Yellow [2] Yellow [2]  
FIP/RP Status Pending/ Implemented Yes [1]    
Contributions 517,000 265,000 46,000
Surcharge Imposed No    
Expiration Date of Collective Bargaining Agreement Jun. 30, 2014 [3]    
All Other Funds [Member]
      
Note 16 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items]      
Contributions $ 2,608,000 [4] $ 4,290,000 [4] $ 2,186,000 [4]
[1] Indicates whether the plan has a financial improvement plan ("FIP") or a rehabilitation plan ("RP") which is either pending or has been implemented.
[2] The most recent PPA zone status available in 2013 and 2012 is for the plan's year-end during 2012 and 2011, respectively. The zone status is based on information that we received from the plan and is certified by the plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the orange zone are less than 80 percent funded and have an Accumulated Funding Deficiency in the current year or projected into the next six years, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded.
[3] Lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject.
[4] 4These funds include multiemployer plans for pensions and other employee benefits. The total individually insignificant multiemployer pension costs contributed were $603,000, $466,000 and $299,000 for 2013, 2012 and 2011, respectively, and are included in the contributions to all other funds along with contributions to other types of benefit plans. Other employee benefits include certain coverage for medical, prescription drug, dental, vision, life and accidental death and dismemberment, disability and other benefit costs. Due to our 2011 acquisitions (Refer to Note 2) there has been an increase in the number of Sterling employees that participate in multiemployer plans affecting the comparability between 2013, 2012 and 2011 years. The acquisitions occurred August 1, 2011 and resulted in five months of pension and other retirement expenses in that year. During 2012, the Company incurred the entire year of expenses.