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 32 Months Ended
Mar. 31, 2012
Property
acre
Death
Customer
Insurer
Lawsuit
Mar. 31, 2011
Customer
Mar. 31, 2010
Mar. 31, 2012
Insurer
Customer
Lawsuit
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 23,900,000 26,100,000          
Maximum guaranteed residual value 149,800,000     149,800,000      
Estimated committed capital remainder of current year 20,500,000     20,500,000      
Estimated committed capital in 2013 4,500,000     4,500,000      
Estimated committed capital in 2014 1,400,000     1,400,000      
Purchase commitments related to operating equipment and vehicles 39,700,000     39,700,000      
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     1 0    
Minimum percentage of billed and unbilled accounts receivable         10% or more    
Minimum percentage of billed and unbilled accounts receivable 11.50%     11.50%      
Amount of billed and unbilled receivables accounted for by one customer 144,900,000     144,900,000      
Number of customers representing ten percent or more of consolidated revenues 0 0          
Minimum percentage of revenue 10% or more 10% or more          
General liability insurance claims deductible 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      
Worker's compensation claims per occurrence 5,000,000 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 1,000,000      
Employee health care benefit plans subject to deductible per claimant 350,000 350,000 350,000 350,000      
Gross amount accrued for insurance claims 194,900,000     194,900,000 201,200,000    
Long-term insurance claims 147,100,000     147,100,000 155,400,000    
Related insurance recoveries receivables 60,700,000     60,700,000 63,100,000    
Related insurance recoveries/receivables included in prepaid expenses and other current assets 12,700,000     12,700,000 9,800,000    
Related insurance recoveries receivables included in other assets net 48,000,000     48,000,000 53,300,000    
Letters of credit outstanding issued under credit facility 182,400,000     182,400,000      
Total amount of outstanding performance bonds 2,070,000,000     2,070,000,000      
Estimated cost to complete bonded projects 681,800,000     681,800,000      
Partial withdrawal liability $ 32,600,000     $ 32,600,000 $ 32,600,000