Related Party Transactions - Summary of Fees to Vornado (Detail) - Vornado - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Related Party Transaction [Line Items]
Fees to related party	$ 2,202	$ 2,565
Company management fees
Related Party Transaction [Line Items]
Fees to related party	700	657
Development fees
Related Party Transaction [Line Items]
Fees to related party	146	24
Leasing fees
Related Party Transaction [Line Items]
Fees to related party	50	737
Property management, cleaning, engineering and security fees
Related Party Transaction [Line Items]
Fees to related party	$ 1,306	$ 1,147