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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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