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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Customer
Dec. 31, 2012
Customer
Dec. 31, 2011
Customer
Dec. 31, 2010
Customer
Commitment And Contingencies [Line Items]          
Rent expense related to operating leases     $ 92,300,000 $ 110,100,000 $ 100,000,000
Maximum guaranteed residual value     208,100,000    
Estimated committed capital expenditures for 2013     17,400,000    
Purchase commitments related to operating equipment and vehicles for 2013     13,500,000    
Percent of consolidated revenues for one major customer       11.00% 11.00%
Number of customer represent ten percent or more of accounts receivable   1 2 1 0
Minimum percentage of revenue     10% or more 10% or more 10% or more
Minimum percentage of billed and unbilled accounts receivable   10% or more 10% or more 10% or more  
Number of customers representing ten percent or more of consolidated revenues     0 1 1
Employer's liability claims subject to deductible per occurrence     1,000,000 1,000,000  
General liability insurance claims deductible     5,000,000 5,000,000  
Worker's compensation claims per occurrence     5,000,000 5,000,000  
Auto liability insurance claims deductible     5,000,000 5,000,000  
Employee health care benefit plans subject to deductible per claimant     375,000    
Gross amount accrued for insurance claims   201,200,000 160,800,000 201,200,000  
Long-term insurance claims   155,400,000 120,200,000 155,400,000  
Related insurance recoveries receivables   63,100,000 22,200,000 63,100,000  
Related insurance recoveries/receivables included in prepaid expenses and other current assets   9,800,000 2,300,000 9,800,000  
Related insurance recoveries receivables included in other assets net   53,300,000 19,900,000 53,300,000  
Letters of credit outstanding issued under credit facility     183,200,000    
Total amount of outstanding performance bonds     2,000,000,000    
Estimated cost to complete bonded projects     643,400,000    
Partial withdrawal liability   32,600,000 32,600,000 32,600,000  
Multiemployer Plan Withdrawal Obligation, amount suggested by Plan which is different than amount recorded by company 39,700,000 32,800,000 40,100,000    
Customer One [Member]
          
Commitment And Contingencies [Line Items]          
Percentage of billed and accrued accounts receivable     16.00%    
Other Customer [Member]
          
Commitment And Contingencies [Line Items]          
Percentage of billed and accrued accounts receivable     11.00%    
National Gas Company of Trinidad and Tobago Arbitration [Member]
          
Commitment And Contingencies [Line Items]          
Damages Sought by Company in Arbitration, Value     16,500,000    
Loss Contingency, Damages Sought by Customer in Arbitration counterclaim, Value     79,500,000    
California Wildfire San Diego [Member]
          
Commitment And Contingencies [Line Items]          
Number of lawsuits related to California wildfire litigation     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    
Number of Insurers reserving right to contest coverage     1    
Loss Contingency, Settlement Agreement, Consideration     33,800,000    
Expense under insurance previously recorded     7,500,000    
Expenses funded by insurer     26,300,000    
Liability recorded for fire claims         35,000,000
Insurance recovery receivable         35,000,000
Amount sought by one insurer which reserves the right to contest coverage     25,000,000    
Land damaged due to wildfire, in acres     16,800    
California Wildfire Amador County [Member]
          
Commitment And Contingencies [Line Items]          
Liability recorded for fire claims     8,500,000    
Demand for payment of fire suppression costs     8,500,000    
USDA intends to seek this amount     51,300,000    
Number of Insurers Participating Under a Reservation of Rights     2    
Insurance recovery receivable     $ 8,500,000    
Number of other insurers participating but have not stated a position     2