Investment in Unconsolidated Joint Venture - Consolidated Balance Sheet (Detail) - Worldwide Plaza [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Real estate assets, at cost	$ 825,316	$ 825,310
Less accumulated depreciation and amortization	(192,092)	(185,377)
Total real estate assets, net	633,224	639,933
Cash and cash equivalents	36,614	15,964
Other assets	149,640	161,285
Total Assets	819,478	817,182
Debt	1,216,161	1,213,193
Other liabilities	130,044	126,142
Total liabilities	1,346,205	1,339,335
Deficit	(526,727)	(522,153)
Total liabilities and deficit	$ 819,478	$ 817,182