Investment in Unconsolidated Joint Venture (Detail) - Liquidation Value [Member] - Worldwide Plaza [Member]	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cravath, Swaine & Moore LLP [Member]
Revenue, Major Customer [Line Items]
Percentage of total annualized rental income	50.00%	48.00%	48.00%
Nomura Holdings America, Inc [Member]
Revenue, Major Customer [Line Items]
Percentage of total annualized rental income	29.00%	30.00%	31.00%