Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textual)

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Commitments and Contingencies (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Customer
Lawsuit
Insurer
Jun. 30, 2011
Customer
Jun. 30, 2012
Death
Property
Customer
acre
Lawsuit
Insurer
Jun. 30, 2011
Customer
Jun. 30, 2010
Dec. 31, 2011
Customer
Dec. 31, 2010
California Wildfire San Diego [Member]
Dec. 31, 2010
California Wildfire Amador County [Member]
Commitments and Contingencies (Textual) [Abstract]                
Liability recorded for fire claims             $ 35,000,000 $ 8,500,000
Insurance recovery receivable             35,000,000 8,500,000
Commitments and Contingencies (Textual) [Abstract]                
Rent expense related to operating leases 24,200,000 29,100,000 48,100,000 55,200,000        
Maximum guaranteed residual value 150,200,000   150,200,000          
Estimated committed capital remainder of current year 21,400,000   21,400,000          
Estimated committed capital in 2013 6,000,000   6,000,000          
Purchase commitments related to operating equipment and vehicles for the remainder of 2012 36,900,000   36,900,000          
Purchase commitments related to operating equipment and vehicles for 2013 4,400,000   4,400,000          
Number of lawsuits related to California wildfire litigation 4   4          
Amount of acreage damaged due to wildfire     198,000          
Number of homes and structures damaged due to wildfire     1,500          
Alleged deaths caused by wildfire     2          
Alleged number of personal injuries caused by wildfire     Numerous          
Land damaged due to wildfire, in acres     16,800          
Number of Insurers Participating Under a Reservation of Rights 2   2          
Demand for payment of fire suppression costs 8,500,000   8,500,000          
Amount of damages or penalties sought by USDA 59,800,000   59,800,000          
USDA intends to seek this amount 51,300,000   51,300,000          
Number of customers representing ten percent or more of accounts receivables             1    
Minimum percentage of billed and unbilled accounts receivable 10% or more   10% or more          
Minimum percentage of billed and unbilled accounts receivable 10.00%   10.00%          
Amount of billed and unbilled receivables accounted for by one customer 185,700,000   185,700,000          
Amount of billed and unbilled receivables accounted for by one customer, percentage 13.60%   13.60%          
Number of customers representing ten percent or more of consolidated revenues                    
Minimum percentage of revenue     10% or more 10% or more        
General liability insurance claims deductible 5,000,000 5,000,000     5,000,000      
Auto liability insurance claims deductible 5,000,000 5,000,000     5,000,000      
Worker's compensation claims per occurrence 5,000,000 5,000,000     5,000,000      
Employer's liability claims subject to deductible per occurrence 1,000,000 1,000,000     1,000,000      
Employee health care benefit plans subject to deductible per claimant 350,000 350,000     350,000      
Gross amount accrued for insurance claims 189,100,000   189,100,000     201,200,000    
Long-term insurance claims 142,300,000   142,300,000     155,400,000    
Related insurance recoveries receivables 57,600,000   57,600,000     63,100,000    
Related insurance recoveries/receivables included in prepaid expenses and other current assets 14,500,000   14,500,000     9,800,000    
Related insurance recoveries receivables included in other assets net 43,100,000   43,100,000     53,300,000    
Letters of credit issued under the credit facility 173,700,000   173,700,000          
Total amount of outstanding performance bonds 2,150,000,000   2,150,000,000          
Estimated cost to complete bonded projects 436,600,000   436,600,000          
Partial withdrawal liability $ 32,600,000   $ 32,600,000     $ 32,600,000