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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 Customer | Sep. 30, 2012 Customer | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 Customer | Sep. 30, 2012 Customer | Dec. 31, 2012 Customer | Apr. 21, 2010 mi
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Rent expense related to operating leases | $ 28,500,000 | $ 22,400,000 |  |  | $ 80,200,000 | $ 66,200,000 |  |
Maximum guaranteed residual value | 278,400,000 |  |  |  | 278,400,000 |  |  |
Estimated committed capital remainder of current year | 10,100,000 |  |  |  | 10,100,000 |  |  |
Estimated committed capital in 2014 | 17,700,000 |  |  |  | 17,700,000 |  |  |
Related insurance recoveries receivables | 12,600,000 |  |  |  | 12,600,000 |  | 22,200,000 |
Length of electrical transmission line to be constructed under contract |  |  |  |  |  |  |  | 117
Commencement of arbitration |  |  |  |  | 2013-10-02 |  |  |
Per annum statutory interest under California law on amounts affirmed in arbitration |  |  |  |  | 10.00% |  |  |
Number of customer represent ten percent or more of accounts receivable | 2 |  |  |  | 2 |  | 2 |
Number of customers representing ten percent or more of consolidated revenues | 0 | 0 |  |  | 0 | 0 |  |
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 | 164,900,000 |  |  |  | 164,900,000 |  | 160,800,000 |
Long-term insurance claims | 122,900,000 |  |  |  | 122,900,000 |  | 120,200,000 |
Related insurance recoveries/receivables included in prepaid expenses and other current assets | 800,000 |  |  |  | 800,000 |  | 2,300,000 |
Related insurance recoveries receivables included in other assets net | 11,800,000 |  |  |  | 11,800,000 |  | 19,900,000 |
Letters of credit outstanding issued under credit facility | 226,400,000 |  |  |  | 226,400,000 |  |  |
Total amount of outstanding performance bonds | 2,350,000,000 |  |  |  | 2,350,000,000 |  |  |
Estimated cost to complete bonded projects | 433,000,000 |  |  |  | 433,000,000 |  |  |
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 |
Sales [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 10.00% |  |  |
Consolidated Net Position [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage | 10.00% |  |  |  | 10.00% |  | 10.00% |
Customer One [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Percentage of net position | 13.00% |  |  |  | 13.00% |  | 16.00% |
Customer One [Member] | Sales [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 10.00% |  |  |
Other Customer [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Percentage of net position | 10.00% |  |  |  | 10.00% |  | 11.00% |
2013 [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Purchase commitments related to operating equipment and vehicles | 9,600,000 |  |  |  | 9,600,000 |  |  |
2014 [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Purchase commitments related to operating equipment and vehicles | 9,200,000 |  |  |  | 9,200,000 |  |  |
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 |  |  |
Howard Midstream Energy Partners, LLC. [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Outstanding capital commitment to be paid in fourth quarter of 2013 | 8,300,000 |  |  |  | 8,300,000 |  |  |
Unconsolidated Affiliates [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Additional capital commitment to be paid before the end of 2015 | 13,200,000 |  |  |  | 13,200,000 |  |  |
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 |  |  |

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