Transactions with Curbline Properties - Additional Information (Detail) - USD ($)		12 Months Ended
	Oct. 01, 2024	Dec. 31, 2024		Dec. 31, 2023	Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Estimated cost of redevelopment projects		$ 33,700,000
Transaction costs and other expense		$ 2,184,000		$ 836,000	$ 1,949,000
Fee percentage of aggregate amount of gross revenue		2.00%
Amounts receivable from curbline		$ 1,800,000
Amounts payable to curbline		33,800,000
General and administrative		47,080,000		50,867,000	46,564,000
Fee and other income		8,181,000		8,553,000	14,966,000
Accounts payable and other liabilities		81,723,000		162,490,000
Termination fee paid	$ 12,000,000
Shared Services Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Transaction costs and other expense		500,000
Fee percentage of aggregate amount of gross revenue	2.00%
Separate fee amount related to the provision of services	$ 0
Agreement expiring date	Oct. 01, 2027
Description of event of certain early terminations	In the event of certain early terminations of the Shared Services Agreement, the Company will be obligated to pay a termination fee to the Operating Partnership equal to $2.5 million multiplied by the number of whole or partial fiscal quarters remaining in the Shared Services Agreement’s three-year term (or $12.0 million in the event the Company terminates the agreement for convenience on its second anniversary).
Fee and other income		500,000
Termination fee paid	$ 2,500,000
Termination term	3 years
Other [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Fee and other income		600,000
Separation and Distributions Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Estimated cost of redevelopment projects		32,900,000
Curbline [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Transaction costs and other expense		30,879,000	[1]	$ 2,376,000	$ 10,000
Incremental fair value of services provided to Curbline		$ 500,000

[1] Through September 30, 2024.