Equity Interest in Ernest and Related Loans Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	$ 196,500
Cost	196,500
Mortgage Loans
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	100,000
Cost	100,000
Acquisition Loan
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	93,200
Cost	93,200
Equity Investments
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	3,300
Cost	$ 3,300