Summary of Entries to Record the Proceeds from Convertible Notes (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 811,024,000	$ 620,000,000
Senior Convertible Notes due 2017
Debt Instrument [Line Items]
Cash	260,500,000
Other assets (deferred financing costs)	6,800,000
Long-term debt	(229,200,000)
Additional paid-in capital	$ (38,100,000)

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Additional paid-in capital or capital from other sources not otherwise defined. Use this element if the registrant wishes to distinguish between Additional paid-in capital from Other Additional Capital. The following adjustments are some examples of Other Additional Capital: recording the issuance of debt issued with a beneficial conversion feature, the issuance of convertible debt at a substantial premium, certain tax consequences of equity instruments awarded to employees, and accounting for certain expenses and liabilities paid for by the principal shareholder.

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