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Net Book Values of Estimated Fair Values of Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Senior Secured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Book Value	$ 750,000	$ 750,000
Estimated Fair Value	785,625	697,500
Secured Promissory Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Book Value	1,700	2,056
Estimated Fair Value	$ 1,700	$ 2,056

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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