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Long-term Debt and Capital Lease Obligations - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Debt Instrument [Line Items]
Senior secured bank credit facility	$ 75,000,000	$ 25,000,000
3 3/4% Senior Subordinated Convertible Notes Due 2012
Debt Instrument [Line Items]
Convertible notes maturity date	Jul. 15, 2012
Repayment of outstanding convertible notes	151,300,000
Accrued interest on convertible notes	$ 2,800,000

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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