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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 Customer | Mar. 31, 2012 Customer | Dec. 31, 2011 | Dec. 31, 2012 Customer
Commitment And Contingencies [Line Items] |  |  |  |
Rent expense related to operating leases | $ 24,300,000 | $ 21,800,000 |  |
Maximum guaranteed residual value | 239,000,000 |  |  |
Estimated committed capital remainder of current year | 32,900,000 |  |  |
Estimated committed capital in 2014 | 2,900,000 |  |  |
Estimated committed capital in 2015 | 400,000 |  |  |
Purchase commitments related to operating equipment and vehicles for 2013 | 20,500,000 |  |  |
Number of customer represent ten percent or more of accounts receivable | 2 |  |  | 2
Percent of consolidated revenues for one major customer | 14.00% |  |  |
Number of customers representing ten percent or more of consolidated revenues | 1 | 0 |  |
Minimum percentage of revenue | 10% or more | 10% or more |  |
Minimum percentage of billed and unbilled accounts receivable | 10% or more | 10% or more |  |
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 | 167,900,000 |  |  | 160,800,000
Long-term insurance claims | 125,700,000 |  |  | 120,200,000
Related insurance recoveries receivables | 22,400,000 |  |  | 22,200,000
Related insurance recoveries/receivables included in prepaid expenses and other current assets | 2,200,000 |  |  | 2,300,000
Related insurance recoveries receivables included in other assets net | 20,200,000 |  |  | 19,900,000
Letters of credit outstanding issued under credit facility | 183,600,000 |  |  |
Total amount of outstanding performance bonds | 2,120,000,000 |  |  |
Estimated cost to complete bonded projects | 500,300,000 |  |  |
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
Customer One [Member] |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Percentage of billed and accrued accounts receivable | 19.00% |  |  | 16.00%
Other Customer [Member] |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Percentage of billed and accrued accounts receivable | 11.00% |  |  | 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 Amador County [Member] |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Demand for payment of fire suppression costs | 8,500,000 |  |  |
Liability recorded for fire claims | 8,500,000 |  |  |
Insurance recovery receivable | 8,500,000 |  |  |
USDA intends to seek amount for restoration and other damages | $ 51,300,000 |  |  |
Number of insurers participating under a reservation of rights | 2 |  |  |
Number of other insurers participating but have not stated a position | 2 |  |  |

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