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Commitments and Contingencies - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Oct. 09, 2013
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Customer
Dec. 31, 2012
Customer
Dec. 31, 2011
Customer
Dec. 31, 2013
Sales [Member]
Minimum [Member]
Dec. 31, 2012
Sales [Member]
Minimum [Member]
Dec. 31, 2011
Sales [Member]
Minimum [Member]
Dec. 31, 2013
Consolidated Net Position [Member]
Minimum [Member]
Dec. 31, 2012
Consolidated Net Position [Member]
Minimum [Member]
Dec. 31, 2013
Customer One [Member]
Dec. 31, 2012
Customer One [Member]
Dec. 31, 2011
Customer One [Member]
Sales [Member]
Minimum [Member]
Dec. 31, 2013
Other Customer [Member]
Dec. 31, 2012
Other Customer [Member]
Dec. 31, 2013
2014 [Member]
Dec. 31, 2013
Sunrise Powerlink Project [Member]
Apr. 21, 2010
Sunrise Powerlink Project [Member]
mi
Dec. 31, 2013
National Gas Company of Trinidad and Tobago Arbitration [Member]
Dec. 31, 2013
California Wildfire Amador County [Member]
acre
Loss Contingencies [Line Items]                                          
Outstanding capital commitment       $ 13,100,000                                  
Rent expense related to operating leases       112,800,000 92,300,000 110,100,000                              
Maximum guaranteed residual value       304,800,000                                  
Estimated committed capital expenditures in 2014       38,800,000                                  
Purchase commitments related to operating equipment and vehicles                                 13,700,000        
Land damaged due to wildfire, in acres                                         16,800
Demand for payment of fire suppression costs                                         8,500,000
Liability recorded for fire claims                                         8,500,000
Related insurance recoveries receivables       9,100,000 22,200,000                               8,500,000
USDA intends to seek amount for restoration and other damages                                         51,300,000
Damages Sought by Company in Arbitration, Value                                       16,500,000  
Loss Contingency, Damages Sought by Customer in Arbitration counterclaim, Value                                       79,500,000  
Length of electrical transmission line to be constructed under contract                                     117    
Claim for breach of contract                                   165,000,000      
Counterclaim for alleged untimely performance and breach of contract                                   32,000,000      
Percentage of net position                       15.00% 16.00%   11.00% 11.00%          
Number of customer represent ten percent or more of accounts receivable       2 2                                
Number of customers representing ten percent or more of consolidated revenues       0 0 1                              
Concentration risk percentage             10.00% 10.00% 10.00% 10.00% 10.00%     11.00%              
Employer's liability claims subject to deductible per occurrence       1,000,000 1,000,000                                
General liability insurance claims deductible       10,000,000 5,000,000                                
Worker's compensation claims per occurrence       5,000,000 5,000,000                                
Auto liability insurance claims deductible       10,000,000 5,000,000                                
Employee health care benefit plans subject to deductible per claimant       375,000                                  
Gross amount accrued for insurance claims       161,800,000 160,800,000                                
Long-term insurance claims       122,600,000 120,200,000                                
Related insurance recoveries/receivables included in prepaid expenses and other current assets       700,000 2,300,000                                
Related insurance recoveries receivables included in other assets net       8,400,000 19,900,000                                
Letters of credit outstanding issued under credit facility       240,300,000                                  
Total amount of outstanding performance bonds       2,680,000,000                                  
Estimated cost to complete bonded projects       671,400,000                                  
Partial withdrawal liability     32,600,000     32,600,000                              
Multiemployer Plan Withdrawal Obligation, amount suggested by Plan which is different than amount recorded by company 6,900,000 39,700,000 32,800,000   40,100,000                                
Multiemployer plan withdrawal obligation complete withdrawal 4,800,000                                        
Multiemployer plan withdrawal obligation accrued       4,300,000                                  
Cash proceeds deposited in Escrow account $ 2,100,000