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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2012 | Dec. 31, 2011 Customer | Dec. 31, 2012 Customer | Dec. 31, 2011 Customer | Dec. 31, 2010 Customer
Commitment And Contingencies [Line Items] |  |  |  |  |
Rent expense related to operating leases |  |  | $ 92,300,000 | $ 110,100,000 | $ 100,000,000
Maximum guaranteed residual value |  |  | 208,100,000 |  |
Estimated committed capital expenditures for 2013 |  |  | 17,400,000 |  |
Purchase commitments related to operating equipment and vehicles for 2013 |  |  | 13,500,000 |  |
Percent of consolidated revenues for one major customer |  |  |  | 11.00% | 11.00%
Number of customer represent ten percent or more of accounts receivable |  | 1 | 2 | 1 | 0
Minimum percentage of revenue |  |  | 10% or more | 10% or more | 10% or more
Minimum percentage of billed and unbilled accounts receivable |  | 10% or more | 10% or more | 10% or more |
Number of customers representing ten percent or more of consolidated revenues |  |  | 0 | 1 | 1
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 |  | 201,200,000 | 160,800,000 | 201,200,000 |
Long-term insurance claims |  | 155,400,000 | 120,200,000 | 155,400,000 |
Related insurance recoveries receivables |  | 63,100,000 | 22,200,000 | 63,100,000 |
Related insurance recoveries/receivables included in prepaid expenses and other current assets |  | 9,800,000 | 2,300,000 | 9,800,000 |
Related insurance recoveries receivables included in other assets net |  | 53,300,000 | 19,900,000 | 53,300,000 |
Letters of credit outstanding issued under credit facility |  |  | 183,200,000 |  |
Total amount of outstanding performance bonds |  |  | 2,000,000,000 |  |
Estimated cost to complete bonded projects |  |  | 643,400,000 |  |
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 | 32,800,000 | 40,100,000 |  |
Customer One [Member] |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |
Percentage of billed and accrued accounts receivable |  |  | 16.00% |  |
Other Customer [Member] |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |
Percentage of billed and accrued accounts receivable |  |  | 11.00% |  |
National Gas Company of Trinidad and Tobago Arbitration [Member] |  |  |  |  |
Commitment And 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 San Diego [Member] |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |
Number of lawsuits related to California wildfire litigation |  |  | 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 |  |
Number of Insurers reserving right to contest coverage |  |  | 1 |  |
Loss Contingency, Settlement Agreement, Consideration |  |  | 33,800,000 |  |
Expense under insurance previously recorded |  |  | 7,500,000 |  |
Expenses funded by insurer |  |  | 26,300,000 |  |
Liability recorded for fire claims |  |  |  |  | 35,000,000
Insurance recovery receivable |  |  |  |  | 35,000,000
Amount sought by one insurer which reserves the right to contest coverage |  |  | 25,000,000 |  |
Land damaged due to wildfire, in acres |  |  | 16,800 |  |
California Wildfire Amador County [Member] |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |
Liability recorded for fire claims |  |  | 8,500,000 |  |
Demand for payment of fire suppression costs |  |  | 8,500,000 |  |
USDA intends to seek this amount |  |  | 51,300,000 |  |
Number of Insurers Participating Under a Reservation of Rights |  |  | 2 |  |
Insurance recovery receivable |  |  | $ 8,500,000 |  |
Number of other insurers participating but have not stated a position |  |  | 2 |  |

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