Related Party Transactions - Summary of Fees to Vornado (Detail) - Vornado - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Fees to related party	$ 2,576	$ 2,202
Company management fees
Related Party Transaction [Line Items]
Fees to related party	700	700
Development fees
Related Party Transaction [Line Items]
Fees to related party	33	146
Leasing fees
Related Party Transaction [Line Items]
Fees to related party	411	50
Property management, cleaning, engineering and security fees
Related Party Transaction [Line Items]
Fees to related party	$ 1,432	$ 1,306