Properties Held for Sale - Summary of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets held for sale:
Right-of-use assets	$ 457,662	$ 0
Receivable arising from the straight-lining of rents	766,634	935,131
Deferred leasing costs, net	345,241	400,313
Identified intangible assets, net	34,161	136,781
Assets held for sale	3,027,058	0
Liabilities related to assets held for sale:
Mortgages payable, net	6,519,189	8,167,798
Lease liabilities	484,173	0
Deferred revenue	71,328	167,730
Liabilities related to assets held for sale	1,097,350	$ 0
Fifth Avenue and Times Square JV \| Disposal Group, Held-for-sale, Not Discontinued Operations
Assets held for sale:
Real estate, net	2,656,509
Right-of-use assets	49,134
Restricted cash	8,828
Receivable arising from the straight-lining of rents	167,612
Deferred leasing costs, net	70,511
Identified intangible assets, net	74,464
Assets held for sale	3,027,058
Liabilities related to assets held for sale:
Mortgages payable, net	971,618
Lease liabilities	41,235
Deferred revenue	84,497
Liabilities related to assets held for sale	$ 1,097,350

Amount of assets held-for-sale that are not part of a disposal group.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Carrying amount as of the balance sheet date, net of valuation allowances and impairment losses, of costs of land expected to be developed in the near term plus capitalized costs of development, for purposes of selling completed units to home buyers or commercial or industrial entities..

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Assets Held for Sale [Abstract]

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This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization, combined with, for an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Liabilities Held-for-sale, Not Part of Disposal Group

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