Debt and Financial Instruments - Additional Information (Detail)					1 Months Ended		3 Months Ended			6 Months Ended
	May 15, 2023	Jan. 03, 2023 USD ($)	Jul. 02, 2021 USD ($)	Mar. 27, 2018 USD ($) Option	Mar. 31, 2020 USD ($) Derivative	Jan. 31, 2020 USD ($) Derivative	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2019 USD ($) Derivative	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Net borrowings on the line of credit										$ 13,300,000	$ 12,400,000
Outstanding borrowings under revolving credit agreement							$ 311,400,000			311,400,000		$ 298,100,000
Letters Of Credit Outstanding Amount							3,100,000			3,100,000		3,100,000
Available borrowing capacity							60,500,000			60,500,000		73,800,000
Compensating Balance Amount							0			0
Interest Rate Swap
Debt Instrument [Line Items]
Derivative interest rate cap, net payment received or accrued from counterparties								$ 122,000
Derivative interest rate cap, payment received or accrued from counterparties										2,600,000
Derivative interest rate cap, offset due to counterparties								$ 35,000,000		4,300,000	35,000
Interest Rate Swap Agreement One | 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
Interest Rate Swap Agreement Two | Cash Flow Hedge
Debt Instrument [Line Items]
Number of interest rate cap agreements | Derivative						1
Derivative instruments, fixed rate						1.4975%
Notional amount						$ 35,000,000
Expiration date of interest rate						Sep. 16, 2024
Interest Rate Swap Agreement Three | Cash Flow Hedge
Debt Instrument [Line Items]
Number of interest rate cap agreements | Derivative									1
Derivative instruments, fixed rate									1.144%
Notional amount									$ 50,000,000
Expiration date of interest rate									Sep. 16, 2024
Level 2
Debt Instrument [Line Items]
Mortgage loan fair value							37,800,000			37,800,000		43,200,000
Mortgage debt							40,000,000			40,000,000		$ 45,000,000
Derivative interest rate cap, net payment received or accrued from counterparties										2,500,000	$ 412,000
Derivative interest rate cap, payment received or accrued from counterparties							1,400,000
Level 2 | Interest Rate Swap
Debt Instrument [Line Items]
Liability derivatives, fair value							$ 11,000,000			$ 11,000,000
Desert Valley Medical Center Fixed Rate Mortgage Loan | Nonrecourse
Debt Instrument [Line Items]
Repayment of mortgage loan		$ 4,200,000
Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				0.20%
Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Margin points added to the reference rate	0.10%			1.20%
Secured Overnight Financing Rate (SOFR) | Interest Rate Swap Agreement One | Cash Flow Hedge
Debt Instrument [Line Items]
Derivative instruments, fixed rate	0.505%
Secured Overnight Financing Rate (SOFR) | Interest Rate Swap Agreement Two | Cash Flow Hedge
Debt Instrument [Line Items]
Derivative instruments, fixed rate	1.41%
Secured Overnight Financing Rate (SOFR) | Interest Rate Swap Agreement Three | Cash Flow Hedge
Debt Instrument [Line Items]
Derivative instruments, fixed rate	1.064%
Credit Agreement
Debt Instrument [Line Items]
Outstanding borrowing			$ 350,000,000	$ 375,000,000
Net borrowings on the line of credit			350,000,000	$ 50,000,000
Unsecured revolving amended credit agreement terminated date				Jul. 02, 2025
Increase in borrowing capacity			$ 375,000,000
Number of additional six month extension options | Option				2
Credit Agreement | Swingline/Short-Term Loans
Debt Instrument [Line Items]
Outstanding borrowing				$ 30,000,000
Credit Agreement | Letters of Credit
Debt Instrument [Line Items]
Outstanding borrowing				$ 40,000,000
Revolving A Facility
Debt Instrument [Line Items]
Credit facility, Interest Rate Terms										Borrowings under the Credit Agreement will bear interest annually at a rate equal to, at our option, at 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 prior to the first amendment ranges from 1.10% to 1.35% for LIBOR loans and 0.10% to 0.35% for Base Rate loans.
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 adjusted term SOFR plus 1%.
Revolving A Facility | Minimum
Debt Instrument [Line Items]
Facility fee payable on commitment				0.15%
Revolving A Facility | Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Margin points added to the reference rate				1.10%
Revolving A Facility | Minimum | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				0.10%
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)
Debt Instrument [Line Items]
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 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Margin points added to the reference rate				1.35%
Revolving A Facility | Maximum | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate				0.35%
Revolving B Facility
Debt Instrument [Line Items]
Facility fee payable on commitment										0.20%
Revolving B Facility | Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate										0.20%
Revolving B Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Margin points added to the reference rate										1.20%