Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textuals)

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Commitments and Contingencies (Details Textuals) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 23 Months Ended
Jun. 30, 2011
acre
Jun. 30, 2010
Dec. 31, 2011
Jun. 30, 2011
Years
acre
Jun. 30, 2010
Dec. 31, 2012
Jun. 30, 2011
Jun. 16, 2011
Jun. 06, 2011
Apr. 15, 2011
Dec. 31, 2010
Commitments And Contingencies (Textuals) [Abstract]                      
Percentage of Interest In Unincorporated Joint Venture 50.00%     50.00%     50.00%        
Rent expense related to operating leases $ 29,100,000 $ 28,100,000   $ 55,200,000 $ 54,900,000            
Maximum guaranteed residual value 116,800,000     116,800,000     116,800,000        
Committed capital expenditures     25,100,000     6,800,000          
Number of lawsuits related to California wildfire litigation 4     4     4        
Amount of acreage damaged due to wildfire 198,000     198,000              
Number of homes and structures damaged due to wildfire 1,500     1,500              
Alleged deaths caused by wildfire 2     2              
Alleged number of personal injuries caused by wildfire Numerous     Numerous              
Insurance recovery receivable related to California wildfire litigation 35,000,000     35,000,000     35,000,000        
Land damaged due to wildfire, in acres 16,800     16,800              
Number of Insurers Claiming Coverage does not exist               1 1 1  
Number of Insurers Participating Under a Reservation of Rights 2     2     2        
Payment of fire suppression costs 8,500,000     8,500,000     8,500,000        
Other damages 51,300,000     51,300,000     51,300,000        
Percentage of billed and accrued receivables for significant customer                     12.00%
Employer's liability insurance claims deductible 1,000,000 1,000,000   1,000,000 1,000,000   1,000,000        
General liability insurance claims deductible 5,000,000 5,000,000   5,000,000 5,000,000   5,000,000        
Auto liability insurance claims deductible 5,000,000 5,000,000   5,000,000 5,000,000   5,000,000        
Worker's compensation insurance claims deductible 5,000,000 5,000,000   5,000,000 5,000,000   5,000,000        
Employee health care benefit plans subject to deductible per claimant 350,000 350,000   350,000 350,000   350,000        
Gross amount accrued for insurance claims 212,000,000     212,000,000     212,000,000       216,800,000
Long-term insurance claims 158,800,000     158,800,000     158,800,000       164,300,000
Related insurance recoveries/receivables 63,600,000     63,600,000     63,600,000       66,300,000
Related insurance recoveries/receivables included in prepaid expenses and other current assets 12,700,000     12,700,000     12,700,000       9,400,000
Related insurance recoveries/receivables included in other assets, net 50,900,000     50,900,000     50,900,000       56,900,000
Letters of credit outstanding issued under credit facility 187,500,000     187,500,000     187,500,000        
Letters of credit outstanding issued under arrangements other than credit facility 7,400,000     7,400,000     7,400,000        
Total amount of outstanding performance bonds 1,600,000,000     1,600,000,000     1,600,000,000        
Estimated cost to complete bonded projects $ 682,300,000     $ 682,300,000     $ 682,300,000