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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Customer
Mar. 31, 2012
Customer
Dec. 31, 2011
Dec. 31, 2012
Customer
Commitment And Contingencies [Line Items]        
Rent expense related to operating leases $ 24,300,000 $ 21,800,000    
Maximum guaranteed residual value 239,000,000      
Estimated committed capital remainder of current year 32,900,000      
Estimated committed capital in 2014 2,900,000      
Estimated committed capital in 2015 400,000      
Purchase commitments related to operating equipment and vehicles for 2013 20,500,000      
Number of customer represent ten percent or more of accounts receivable 2     2
Percent of consolidated revenues for one major customer 14.00%      
Number of customers representing ten percent or more of consolidated revenues 1 0    
Minimum percentage of revenue 10% or more 10% or more    
Minimum percentage of billed and unbilled accounts receivable 10% or more 10% or more    
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 167,900,000     160,800,000
Long-term insurance claims 125,700,000     120,200,000
Related insurance recoveries receivables 22,400,000     22,200,000
Related insurance recoveries/receivables included in prepaid expenses and other current assets 2,200,000     2,300,000
Related insurance recoveries receivables included in other assets net 20,200,000     19,900,000
Letters of credit outstanding issued under credit facility 183,600,000      
Total amount of outstanding performance bonds 2,120,000,000      
Estimated cost to complete bonded projects 500,300,000      
Partial withdrawal liability     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 19.00%     16.00%
Other Customer [Member]
        
Commitment And Contingencies [Line Items]        
Percentage of billed and accrued accounts receivable 11.00%     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 Amador County [Member]
        
Commitment And Contingencies [Line Items]        
Demand for payment of fire suppression costs 8,500,000      
Liability recorded for fire claims 8,500,000      
Insurance recovery receivable 8,500,000      
USDA intends to seek amount for restoration and other damages $ 51,300,000      
Number of insurers participating under a reservation of rights 2      
Number of other insurers participating but have not stated a position 2