Debt and Financial Instruments - Additional Information (Detail)					1 Months Ended				3 Months Ended		9 Months Ended
	Sep. 16, 2024 USD ($)	Apr. 10, 2024 USD ($)	May 15, 2023	Mar. 27, 2018	Oct. 31, 2024 USD ($) Derivative	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($) Derivative	Mar. 31, 2020 USD ($) Derivative	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Option	Sep. 30, 2023 USD ($)	Jul. 02, 2021 USD ($)
Debt Instrument [Line Items]
Net borrowings on the line of credit											$ 21,150,000	$ 23,400,000
Credit facility, Interest Rate Terms											Borrowings under the Credit Agreement will bear interest at a rate equal to, at our option, the Adjusted Term SOFR for either one, three, or six months or the Base Rate, plus in either case, a specified margin depending on our total leverage ratio, as determined by the formula set forth in the Credit Agreement. The applicable margin after the second amendment ranges from 1.10% to 1.35% for SOFR revolving loans and 0.10% to 0.35% for Base Rate revolving loans. The applicable margin ranges from 1.20% to 1.65% for Adjusted Term SOFR loans and 0.20% to 0.65% for Base Rate term loans.
Outstanding borrowings under revolving credit agreement						$ 347,750,000	$ 326,600,000		$ 347,750,000		$ 347,750,000
Letters Of Credit Outstanding Amount						425,000,000	3,100,000		425,000,000		425,000,000
Available borrowing capacity						77,200,000	$ 45,300,000		77,200,000		77,200,000
Compensating Balance Amount						0			0		0
Interest Rate Swap
Debt Instrument [Line Items]
Derivative interest rate cap, payment received or accrued from counterparties									1,500,000	$ 1,600,000	4,800,000	4,300,000
Interest Rate Swap | Cash Flow Hedge
Debt Instrument [Line Items]
Notional amount	$ 85,000,000
Expiration date of interest rate	Sep. 16, 2024
Interest Rate Swap Agreement One | Cash Flow Hedge
Debt Instrument [Line Items]
Number of interest rate cap agreements | Derivative							1
Derivative instruments, fixed rate							3.9495%
Notional amount	$ 35,000,000						$ 25,000,000
Expiration date of interest rate							Dec. 01, 2027
Interest Rate Swap Agreement Two | Cash Flow Hedge
Debt Instrument [Line Items]
Number of interest rate cap agreements | Derivative								1
Derivative instruments, fixed rate								0.565%
Notional amount								$ 55,000,000
Expiration date of interest rate								Mar. 25, 2027
Level 2
Debt Instrument [Line Items]
Mortgage debt						19,800,000	$ 33,100,000		19,800,000		19,800,000
Mortgage loan fair value						18,400,000	$ 31,200,000		18,400,000		18,400,000
Level 2 | Interest Rate Swap
Debt Instrument [Line Items]
Liability derivatives, fair value						3,300,000			3,300,000		$ 3,300,000
Summerlin Hospital Medical Office Building III Fixed Rate Mortgage Loan
Debt Instrument [Line Items]
Repayment of mortgage loan		$ 12,200,000
Subsequent Event | Interest Rate Swap | Cash Flow Hedge
Debt Instrument [Line Items]
Number of interest rate cap agreements | Derivative					1
Derivative instruments, fixed rate					3.2725%
Notional amount					$ 85,000,000
Expiration date of interest rate					Sep. 30, 2028
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Margin points added to the reference rate			0.10%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Interest Rate Swap Agreement One | Cash Flow Hedge
Debt Instrument [Line Items]
Derivative instruments, fixed rate	1.4975%						3.9495%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Interest Rate Swap Agreement Two | Cash Flow Hedge
Debt Instrument [Line Items]
Derivative instruments, fixed rate	1.144%							0.505%
Notional amount	$ 50,000,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event | Interest Rate Swap | Cash Flow Hedge
Debt Instrument [Line Items]
Derivative instruments, fixed rate					3.2725%
Non-Amortizing Term Loan ("Term Loan") | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Margin points added to the reference rate											1.35%
Credit Agreement
Debt Instrument [Line Items]
Aggregate borrowings under Credit Agreement									17,200,000	23,200,000	$ 64,200,000	57,700,000
Aggregate repayments									12,400,000	$ 13,100,000	43,000,000	$ 34,300,000
Revolving A Facility
Debt Instrument [Line Items]
Facility fee of revolving loan						300,000			300,000		$ 300,000
Revolving A Facility | Minimum
Debt Instrument [Line Items]
Facility fee payable on commitment				0.15%
Revolving A Facility | Minimum | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				0.20%
Revolving A Facility | Minimum | Federal Funds Effective Rate
Debt Instrument [Line Items]
Margin points added to the base rate				0.50%
Revolving A Facility | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				1.20%
Margin points added to the base rate				1.00%
Revolving A Facility | Maximum
Debt Instrument [Line Items]
Facility fee payable on commitment				0.35%
Revolving A Facility | Maximum | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				0.60%
Revolving A Facility | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				1.65%
Revolving B Facility | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate											0.20%
Margin points added to the base rate											0.35%
Revolving B Facility | Federal Funds Effective Rate
Debt Instrument [Line Items]
Facility fee payable on commitment											0.20%
Revolving B Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Margin points added to the reference rate											1.20%
Second Amendment and Restated Revloving Credit Agreement
Debt Instrument [Line Items]
Outstanding borrowing						$ 425,000,000			425,000,000		$ 425,000,000		$ 375,000,000
Net borrowings on the line of credit											$ 50,000,000
Unsecured revolving amended credit agreement terminated date				Jul. 31, 2025		Sep. 30, 2028
Number of additional six month extension options | Option											2
Second Amendment and Restated Revloving Credit Agreement | Minimum | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				0.10%
Second Amendment and Restated Revloving Credit Agreement | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				1.10%
Second Amendment and Restated Revloving Credit Agreement | Maximum | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				0.35%
Second Amendment and Restated Revloving Credit Agreement | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				1.35%
Second Amendment and Restated Revloving Credit Agreement | Swingline/Short-Term Loans
Debt Instrument [Line Items]
Outstanding borrowing						$ 30,000,000			30,000,000		$ 30,000,000
Second Amendment and Restated Revloving Credit Agreement | Non-Amortizing Term Loan ("Term Loan")
Debt Instrument [Line Items]
Outstanding borrowing						125,000,000			125,000,000		125,000,000
Second Amendment and Restated Revloving Credit Agreement | Revolving Loan Commitment
Debt Instrument [Line Items]
Outstanding borrowing						300,000,000			300,000,000		300,000,000
Second Amendment and Restated Revloving Credit Agreement | Letters of Credit
Debt Instrument [Line Items]
Outstanding borrowing						$ 40,000,000			$ 40,000,000		$ 40,000,000