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Commitments, Contingencies and Other Matters - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items] |
Letters of credit, collateral for retrospective premiums and retained losses | $ 40,600,000
Commitments to purchase major equipment | 338,000,000
Current obligation | 37,400,000
Obligation for remainder of the year | 8,400,000
Non Revolving Senior Secured Term Loan |
Commitments and Contingencies Disclosure [Line Items] |
Advance to non-affiliates | 12,000,000
Notes receivable interest rate | 5.00%
Notes receivable | 5,100,000
Repayment of notes receivable | 145,000
Notes receivable outstanding | $ 4,900,000

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