Debt and Financial Instruments - Additional Information (Detail)				1 Months Ended	3 Months Ended
	Mar. 31, 2017 USD ($) MortgageLoan		Mar. 27, 2015 USD ($) Option	Apr. 30, 2017 USD ($)	Mar. 31, 2017 USD ($) MortgageLoan		Sep. 30, 2016 USD ($) Derivative	Jun. 30, 2016 USD ($) Derivative	Mar. 31, 2016 USD ($)	Mar. 31, 2014 USD ($) Derivative	Sep. 30, 2013 USD ($) Derivative	Dec. 31, 2016 USD ($) MortgageLoan	May 24, 2016 USD ($)
Debt Instrument [Line Items]
Outstanding borrowings under revolving credit agreement	$ 169,900,000				$ 169,900,000							$ 201,500,000
Outstanding borrowings under letter of credit	2,700,000				2,700,000
Available borrowing capacity	$ 77,400,000				$ 77,400,000
Number of non-recourse mortgages | MortgageLoan	14				14							15
Balance of Non Recourse Mortgages	$ 102,989,000	[1]			$ 102,989,000	[1]						$ 114,200,000
Mortgage and other notes payable, non-recourse to us, debt premium	368,000	[1]			368,000	[1]						436,000
Financing fees net	353,000	[1]			353,000	[1]						381,000
Repayments of mortgage loan					11,174,000				$ 790,000
Mortgage loan fair value	105,000,000				105,000,000							$ 115,700,000
Interest Rate Cap
Debt Instrument [Line Items]
Number of interest rate cap agreements | Derivative							1	1		2	1
Notional amount							$ 30,000,000	$ 30,000,000		$ 20,000,000	$ 10,000,000
Premium paid							$ 55,000	$ 115,000		$ 134,500	$ 136,000
Expiration date of interest rate cap							Mar. 31, 2019	Mar. 31, 2019		Jan. 31, 2017	Jan. 31, 2017
Summerlin Hospital Medical Office Building III floating rate mortgage loan
Debt Instrument [Line Items]
Repayments of mortgage loan	10,300,000
Summerlin Hospital Medical Office Building III fixed rate mortgage loan | Subsequent Event
Debt Instrument [Line Items]
Refinanced this property with fixed rate mortgage loan				$ 13,200,000
Maturity Date				2024-04
Loan interest rate fixed percentage				4.03%
LIBOR | Interest Rate Cap
Debt Instrument [Line Items]
Derivative instruments, LIBOR rate							1.50%	1.50%		1.50%	1.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowing	$ 250,000,000				$ 250,000,000
Credit Agreement
Debt Instrument [Line Items]
Outstanding borrowing			$ 185,000,000										$ 250,000,000
Unsecured revolving amended 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%
Credit Agreement | LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate	1.625%
Credit Agreement | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate	0.625%
Credit Agreement | Swingline/Short-Term Loans
Debt Instrument [Line Items]
Outstanding borrowing			20,000,000
Credit Agreement | Letters of Credit
Debt Instrument [Line Items]
Outstanding borrowing			$ 40,000,000
Credit Agreement | Minimum
Debt Instrument [Line Items]
Fee payable on unused portion of commitment			0.20%
Credit Agreement | Minimum | LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate			1.50%
Margin points added to the base rate			1.00%
Credit Agreement | Minimum | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate			0.50%
Credit Agreement | Minimum | Federal Funds Effective Rate
Debt Instrument [Line Items]
Margin points added to the base rate			0.50%
Credit Agreement | Maximum
Debt Instrument [Line Items]
Fee payable on unused portion of commitment			0.40%
Credit Agreement | Maximum | LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate			2.00%
Credit Agreement | Maximum | 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 either fully amortize or include a balloon principal payment upon maturity.