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	Jun. 30, 2014	Dec. 31, 2013	Aug. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	$ 44,617	$ 101,100
Secured financing receivable	30,659	30,728
Mortgage loans payable	474,107	444,933
Senior notes payable	75,072	86,250	86,250
Secured financings	0	29,150
Notes payable	1,661	1,742
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0	0
Secured financing receivable	0	0
Mortgage loans payable	0	0
Senior notes payable	79,727	86,940
Secured financings		0
Notes payable	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0	0
Secured financing receivable	0	0
Mortgage loans payable	0	0
Senior notes payable	0	0
Secured financings		0
Notes payable	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	52,906	105,045
Secured financing receivable	30,659	30,728
Mortgage loans payable	473,788	444,785
Senior notes payable	0	0
Secured financings		29,327
Notes payable	1,661	1,742
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	52,906	105,045
Secured financing receivable	30,659	30,728
Mortgage loans payable	473,788	444,785
Senior notes payable	79,727	86,940
Secured financings		29,327
Notes payable	$ 1,661	$ 1,742