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Multiemployer Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Nov. 30, 2011
Dec. 31, 2012
So Cal Pipetrades Trust Funds
Dec. 31, 2011
So Cal Pipetrades Trust Funds
Dec. 31, 2010
So Cal Pipetrades Trust Funds
Dec. 31, 2012
Laborers Pension Trust Fund for Northern California
Dec. 31, 2011
Laborers Pension Trust Fund for Northern California
Dec. 31, 2010
Laborers Pension Trust Fund for Northern California
Dec. 31, 2012
Construction Laborers Pension Trust for Southern California
Dec. 31, 2011
Construction Laborers Pension Trust for Southern California
Dec. 31, 2010
Construction Laborers Pension Trust for Southern California
Dec. 31, 2012
Central Pension Fund of the International Union of Operating Engineers and Participating Employers
Dec. 31, 2011
Central Pension Fund of the International Union of Operating Engineers and Participating Employers
Dec. 31, 2010
Central Pension Fund of the International Union of Operating Engineers and Participating Employers
Dec. 31, 2010
Laborers International Union of North America National (Industrial) Pension Fund
Dec. 31, 2012
Laborers International Union of North America National (Industrial) Pension Fund
Dec. 31, 2011
Laborers International Union of North America National (Industrial) Pension Fund
Dec. 31, 2010
Laborers International Union of North America National (Industrial) Pension Fund
Dec. 31, 2012
Pipeline Industry Benefit Fund
Dec. 31, 2011
Pipeline Industry Benefit Fund
Dec. 31, 2010
Pipeline Industry Benefit Fund
Dec. 31, 2012
Boilermaker-Blacksmith National Pension Trust
Dec. 31, 2011
Boilermaker-Blacksmith National Pension Trust
Dec. 31, 2010
Boilermaker-Blacksmith National Pension Trust
Dec. 31, 2012
Northern California Pipe Trades Pension Plan
Dec. 31, 2011
Northern California Pipe Trades Pension Plan
Dec. 31, 2010
Northern California Pipe Trades Pension Plan
Multiemployer plans                                                          
Estimated net liability and SG & A expense in connection with the withdrawal $ 7,500 $ 5,000   $ 7,500                                                  
SG&A expense related to plan 2,500                                                        
Number of pension plans in which annual contribution was made by the entity during last three years 66                                                        
Contributions for significant plans 22,154 16,911 7,959   5,298 2,931 1,394 4,816 3,501 1,237 2,952 2,373 1,694 2,206 1,797 946   1,995 1,740 826 1,747 1,793 1,110 1,502 1,035 469 1,638 1,741 283
Contributions to other multiemployer plans 7,949 7,271 4,631                                                    
Total contributions made $ 30,103 $ 24,182 $ 12,590                                                    
Temporary surcharge (as a percent)                                 5.00% 10.00%                      
Investment losses amortization period                                   29 years                      
Investment losses amortization period, before amendment                                   15 years                      
Investment losses smoothing period                                   10 years                      
Investment losses smoothing period, before amendment                                   5 years