Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Customer
Jun. 30, 2012
Customer
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Customer
Jun. 30, 2012
Customer
Dec. 31, 2012
Customer
Loss Contingencies [Line Items]              
Rent expense related to operating leases $ 27,400,000 $ 22,000,000     $ 51,700,000 $ 43,800,000  
Maximum guaranteed residual value 250,400,000       250,400,000    
Estimated committed capital remainder of current year 19,400,000       19,400,000    
Estimated committed capital in 2014 8,900,000       8,900,000    
Purchase commitments related to operating equipment and vehicles for 2013 16,500,000       16,500,000    
Related insurance recoveries receivables 12,800,000       12,800,000   22,200,000
Number of customer represent ten percent or more of accounts receivable 2       2   2
Percent of consolidated revenues for one major customer 10.00%       12.00%    
Number of customers representing ten percent or more of consolidated revenues 1 0     1 0  
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 160,600,000       160,600,000   160,800,000
Long-term insurance claims 118,700,000       118,700,000   120,200,000
Related insurance recoveries/receivables included in prepaid expenses and other current assets 1,100,000       1,100,000   2,300,000
Related insurance recoveries receivables included in other assets net 11,700,000       11,700,000   19,900,000
Letters of credit outstanding issued under credit facility 179,200,000       179,200,000    
Total amount of outstanding performance bonds 2,330,000,000       2,330,000,000    
Estimated cost to complete bonded projects 497,800,000       497,800,000    
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]
             
Loss Contingencies [Line Items]              
Percentage of billed and accrued accounts receivable 19.00%       19.00%   16.00%
Other Customer [Member]
             
Loss Contingencies [Line Items]              
Percentage of billed and accrued accounts receivable 12.00%       12.00%   11.00%
Sales [Member] | Minimum [Member]
             
Loss Contingencies [Line Items]              
Concentration risk percentage 10.00% 10.00%     10.00% 10.00%  
Accounts Receivable [Member] | Minimum [Member]
             
Loss Contingencies [Line Items]              
Concentration risk percentage 10.00% 10.00%     10.00% 10.00%  
National Gas Company of Trinidad and Tobago Arbitration [Member]
             
Loss 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]
             
Loss Contingencies [Line Items]              
Land damaged due to wildfire, in acres         16,800    
Demand for payment of fire suppression costs 8,500,000       8,500,000    
Liability recorded for fire claims 8,500,000       8,500,000    
Related insurance recoveries receivables 8,500,000       8,500,000    
USDA intends to seek amount for restoration and other damages $ 51,300,000       $ 51,300,000