Commitments, Contingencies and Other Matters - Additional Information (Detail) (USD $)	6 Months Ended
Jun. 30, 2012
Commitments and Contingencies Disclosure [Line Items]
Letters of credit, collateral for retrospective premiums and retained losses	$ 39,800,000
Commitments to purchase major equipment	220,000,000
Current obligation	33,700,000
Obligation for remainder of the year	4,700,000
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	5,700,000
Repayment of notes receivable	239,000
Notes receivable outstanding	$ 5,500,000

Advances to Non Affiliates

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Notes Receivable Interest Rate

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) more than one year from the balance sheet date. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

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The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.

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