Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments Not Recorded at Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Aug. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans receivable	$ 48,667	$ 101,100
Secured financing receivable	30,700	30,728
Mortgage loans payable	476,424	444,933
Senior notes payable	86,250	86,250	86,250
Secured financings		29,150
Notes payable	1,693	1,742
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans receivable
Secured financing receivable
Mortgage loans payable
Senior notes payable	88,700	86,940
Secured financings
Notes payable
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans receivable
Secured financing receivable
Mortgage loans payable
Senior notes payable
Secured financings
Notes payable
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans receivable	56,952	105,045
Secured financing receivable	30,700	30,728
Mortgage loans payable	476,162	444,785
Senior notes payable
Secured financings		29,327
Notes payable	1,693	1,742
Fair Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans receivable	56,952	105,045
Secured financing receivable	30,700	30,728
Mortgage loans payable	476,162	444,785
Senior notes payable	88,700	86,940
Secured financings		29,327
Notes payable	$ 1,693	$ 1,742