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Commitments And Contingencies (Narrative) (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2012 Customer Insurers LawSuits | Sep. 30, 2011 | Sep. 30, 2012 Property acre Death Customer Insurers LawSuits | Sep. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010 California Wildfire Amador County [Member] | Sep. 30, 2012 California Wildfire San Diego [Member] | Dec. 31, 2010 California Wildfire San Diego [Member]
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Rent expense related to operating leases | $ 24,300,000 | $ 30,900,000 | $ 72,400,000 | $ 86,100,000 |  |  |  |
Maximum guaranteed residual value | 198,100,000 |  | 198,100,000 |  |  |  |  |
Estimated committed capital remainder of current year | 10,100,000 |  | 10,100,000 |  |  |  |  |
Estimated committed capital in 2013 | 10,600,000 |  | 10,600,000 |  |  |  |  |
Purchase commitments related to operating equipment and vehicles for the remainder of 2012 | 7,800,000 |  | 7,800,000 |  |  |  |  |
Purchase commitments related to operating equipment and vehicles for 2013 | 11,500,000 |  | 11,500,000 |  |  |  |  |
Number of lawsuits related to California wildfire litigation | 4 |  | 4 |  |  |  |  |
Amount of acreage damaged due to wildfire |  |  | 198,000 |  |  |  |  |
Number of homes and structures damaged due to wildfire |  |  | 1,500 |  |  |  |  |
Alleged deaths caused by wildfire |  |  | 2 |  |  |  |  |
Alleged number of personal injuries caused by wildfire |  |  | Numerous |  |  |  |  |
Loss Contingency, Settlement Agreement, Consideration | 33,800,000 |  | 33,800,000 |  |  |  |  |
Expense under insurance previously recorded |  |  |  |  |  |  | 7,500,000 |
Expenses funded by insurer |  |  |  |  |  |  | 26,300,000 |
Liability recorded for fire claims |  |  |  |  |  | 8,500,000 |  | 35,000,000
Amount sought by one insurer which reserves the right to contest coverage | 25,000,000 |  | 25,000,000 |  |  |  |  |
Land damaged due to wildfire, in acres |  |  | 16,800 |  |  |  |  |
Demand for payment of fire suppression costs | 8,500,000 |  | 8,500,000 |  |  |  |  |
USDA intends to seek this amount | 51,300,000 |  | 51,300,000 |  |  |  |  |
Amount of damages or penalties sought by USDA | 59,800,000 |  | 59,800,000 |  |  |  |  |
Number of Insurers Participating Under a Reservation of Rights | 2 |  | 2 |  |  |  |  |
Insurance recovery receivable |  |  |  |  |  | 8,500,000 |  |
Damages Sought by Company in Arbitration, Value |  |  | 16,500,000 |  |  |  |  |
Loss Contingency, Damages Sought by Customer in Arbitration counterclaim, Value |  |  | 79,500,000 |  |  |  |  |
Number of customer represent ten percent or more of accounts receivable | 1 |  | 1 |  |  |  |  |
Amount of billed and unbilled receivables accounted for by one customer | 192,700,000 |  | 192,700,000 |  |  |  |  |
Amount of billed and unbilled receivables accounted for by one customer, percentage | 11.40% |  | 11.40% |  |  |  |  |
Minimum percentage of billed and accounts receivable |  |  |  |  | 10% or more |  |  |
Minimum percentage of revenue | 10% or more | 10% or more | 10% or more | 10% or more |  |  |  |
General liability insurance claims deductible | 5,000,000 | 5,000,000 |  |  |  |  |  |
Auto liability insurance claims deductible | 5,000,000 | 5,000,000 |  |  |  |  |  |
Worker's compensation claims per occurrence | 5,000,000 | 5,000,000 |  |  |  |  |  |
Employer's liability claims subject to deductible per occurrence | 1,000,000 | 1,000,000 |  |  |  |  |  |
Employee health care benefit plans subject to deductible per claimant | 350,000 | 350,000 |  |  |  |  |  |
Gross amount accrued for insurance claims | 189,000,000 |  | 189,000,000 |  | 201,200,000 |  |  |
Long-term insurance claims | 143,600,000 |  | 143,600,000 |  | 155,400,000 |  |  |
Related insurance recoveries receivables | 56,500,000 |  | 56,500,000 |  | 63,100,000 |  |  |
Related insurance recoveries/receivables included in prepaid expenses and other current assets | 14,600,000 |  | 14,600,000 |  | 9,800,000 |  |  |
Related insurance recoveries receivables included in other assets net | 41,900,000 |  | 41,900,000 |  | 53,300,000 |  |  |
Letters of credit issued under the credit facility | 179,300,000 |  | 179,300,000 |  |  |  |  |
Total amount of outstanding performance bonds | 2,050,000,000 |  | 2,050,000,000 |  |  |  |  |
Estimated cost to complete bonded projects | 481,700,000 |  | 481,700,000 |  |  |  |  |
Partial withdrawal liability | 32,600,000 |  | 32,600,000 |  | 32,600,000 |  |  |
Multiemployer Plan Withdrawal Obligation, amount suggested by Plan which is different than amount recorded by company | $ 39,700,000 |  |  |  |  |  |  |

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