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Multiemployer Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Multiemployer plans      
Number of pension plans in which annual contribution was made by the entity during last three years 59    
Number of pension plans in which the entity contributed 2    
Contributions for specified plans $ 1,427    
Contributions for significant plans 29,915 19,014 14,135
Contributions to other multiemployer plans 13,004 11,089 10,047
Total contributions made 42,919 30,103 24,182
Central Pension Fund of the International Union of Operating Engineers and Participating Employers
     
Multiemployer plans      
Contributions for significant plans 7,286 2,206 1,797
Laborers International Union of North America National (Industrial) Pension Fund
     
Multiemployer plans      
Contributions for significant plans 5,025 1,995 1,740
Southern California Pipetrades Trust Funds
     
Multiemployer plans      
Contributions for significant plans 6,179 5,298 2,931
Pipeline Industry Benefit Fund
     
Multiemployer plans      
Contributions for significant plans 4,605 1,747 1,793
Laborers Pension Trust Fund for Northern California
     
Multiemployer plans      
Contributions for significant plans 3,869 4,816 3,501
Construction Laborers Pension Trust for Southern California
     
Multiemployer plans      
Contributions for significant plans $ 2,951 $ 2,952 $ 2,373