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Commitments, Contingencies and Other Matters - Additional Information (Detail) (USD $)	3 Months Ended
	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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