220 Central Park South - Narrative (Details) ft² in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) ft²	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Real Estate [Line Items]
Land	$ 3,306,264	$ 3,306,264		$ 3,143,648
Condominium units inventory	$ 307,552	307,552		$ 0
Cash payments for income taxes		$ 61,047	$ 5,292
220 Central Park South
Real Estate [Line Items]
Square footage of real estate property \| ft²	397	397
Land	$ 515,400	$ 515,400
Development costs	1,400,000	1,400,000
Development costs expended	1,100,000	1,100,000
Condominium units inventory	307,552	$ 307,552
Cash payments for income taxes	$ 52,200
Percent of condominium tower where construction has been substantially completed	16.00%	16.00%

Area of a real estate property.

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- Definition

The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas.

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Development Costs Expended

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Percent of Condominium Tower Where Construction Has Been Substantially Completed

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