Related Party Transactions - Summary of Fees to Vornado (Detail) - Vornado - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction [Line Items]
Fees to related party	$ 2,453	$ 1,970	$ 5,029	$ 4,172
Company management fees
Related Party Transaction [Line Items]
Fees to related party	700	700	1,400	1,400
Development fees
Related Party Transaction [Line Items]
Fees to related party	46	122	79	268
Leasing fees
Related Party Transaction [Line Items]
Fees to related party	28	9	439	59
Commission on sale of real estate
Related Party Transaction [Line Items]
Fees to related party	300	0	300	0
Property management, cleaning, engineering and security fees
Related Party Transaction [Line Items]
Fees to related party	$ 1,379	$ 1,139	$ 2,811	$ 2,445