Fair Value of Financial Instruments - Equity Interest in Ernest and Related Loans Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	$ 201,083
Cost	201,083
Fair Value Measurements, Recurring [Member] | Mortgage loans [Member] | Mortgage loans [Member]
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	100,000
Cost	100,000
Fair Value Measurements, Recurring [Member] | Acquisition loan [Member] | Other loans [Member]
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	97,783
Cost	97,783
Fair Value Measurements, Recurring [Member] | Equity investments [Member] | Other assets [Member]
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Fair Value	3,300
Cost	$ 3,300