Debt and Financial Instruments - Additional Information (Detail)				3 Months Ended
	Mar. 31, 2016 USD ($) MortgageLoan		Mar. 27, 2015 USD ($) Option	Mar. 31, 2016 USD ($) MortgageLoan		Mar. 31, 2014 USD ($) Derivative	Sep. 30, 2013 USD ($) Derivative	Dec. 31, 2015 USD ($) MortgageLoan
Debt Instrument [Line Items]
Mortgage loan fair value	$ 112,000,000			$ 112,000,000				$ 112,400,000
Number of non-recourse mortgages | MortgageLoan	14			14				14
Balance of Non Recourse Mortgages	$ 109,466,000	[1]		$ 109,466,000	[1]			$ 110,300,000
Mortgage and other notes payable, non-recourse to us, debt premium	242,000,000			242,000,000				298,000
Financing fees net	376,000,000			376,000,000				398,000
Outstanding borrowings under revolving credit agreement	159,650,000			159,650,000				142,150,000
Outstanding borrowings under letter of credit	3,000,000			3,000,000				3,500,000
Available borrowing capacity	$ 22,300,000			$ 22,300,000				$ 39,300,000
Interest Rate Cap
Debt Instrument [Line Items]
Number of interest rate cap agreements | Derivative						2	1
Notional amount						$ 20,000,000	$ 10,000,000
Premium paid						$ 134,500	$ 136,000
Expiration date of interest rate cap						Jan. 31, 2017	Jan. 31, 2017
LIBOR | Interest Rate Cap
Debt Instrument [Line Items]
Derivative instruments, LIBOR rate						1.50%	1.50%
New Revolving Credit Facility Agreement
Debt Instrument [Line Items]
Outstanding borrowing			$ 185,000,000
Unsecured revolving credit agreement terminated date			2019-03
Number of additional one year extension options | Option			1
Proceeds from Lines of Credit			$ 50,000,000
Credit facility, Interest Rate Terms				One, two, three, or six month LIBOR plus an applicable margin ranging from 1.50% to 2.00% or at the Base Rate plus an applicable margin ranging from 0.50% to 1.00%.
Base rate description				The greatest of: (a) the administrative agent’s prime rate; (b) the federal funds effective rate plus 1/2 of 1%, and; (c) one month LIBOR plus 1%.
Fee payable on unused portion of commitment	0.25%
New Revolving Credit Facility Agreement | LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate	1.625%
New Revolving Credit Facility Agreement | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate	0.625%
New Revolving Credit Facility Agreement | Swingline/Short-Term Loans
Debt Instrument [Line Items]
Outstanding borrowing			20,000,000
New Revolving Credit Facility Agreement | Letters of Credit
Debt Instrument [Line Items]
Outstanding borrowing			$ 50,000,000
Previous Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit agreement terminated date			2015-07
Minimum | New Revolving Credit Facility Agreement
Debt Instrument [Line Items]
Fee payable on unused portion of commitment			0.20%
Minimum | New Revolving Credit Facility Agreement | LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate			1.50%
Margin points added to the base rate			1.00%
Minimum | New Revolving Credit Facility Agreement | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate			0.50%
Minimum | New Revolving Credit Facility Agreement | Federal Funds Effective Rate
Debt Instrument [Line Items]
Margin points added to the base rate			0.50%
Maximum | New Revolving Credit Facility Agreement
Debt Instrument [Line Items]
Fee payable on unused portion of commitment			0.40%
Maximum | New Revolving Credit Facility Agreement | LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate			2.00%
Maximum | New Revolving Credit Facility Agreement | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate			1.00%

[1] All mortgage loans require monthly principal payments through maturity and include a balloon principal payment upon maturity.