Organization and Description of Business - Additional Information (Detail) - Operating Partnership [Member] - Wu/Lighthouse Portfolio, LLC [Member] shares in Millions, ft² in Millions		6 Months Ended	12 Months Ended
	Jan. 17, 2013 Property	Jun. 30, 2021 ft² a Property shares	Dec. 31, 2013
Organization And Description Of Business [Line Items]
Number of commercial properties acquired | Property	25
Ownership interest in partnership units (as a percent)	33.29%		33.78%
Number of shares of common stock that can be issued on conversion of interest in limited partnership | shares		1.9
Number of properties owned and operated | Property		48
Leasable area owned by the company | ft²		5.9
Area of land in New York, New Jersey, Connecticut, and Delaware | a		389
Percentage of ownership owned in joint venture		50.00%
Series B Preferred Stock, Non-Voting [Member]
Organization And Description Of Business [Line Items]
Number of shares of preferred stock that can be issued on conversion of interest in limited partnership | shares		5.4
Due to redemptions of certain shares [Member]
Organization And Description Of Business [Line Items]
Ownership interest in partnership units (as a percent)		34.67%