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Common Stock and Limited Partners' Capital Account, Units Issued During Period, Value

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Loss Contingency, Damages Awarded, Freely-tradable Common Stock or Operating Units, Maximum

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Loss Contingency, Damages Awarded, Percent in Cash, Minimum

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Number of Entities to be Treated as Taxable REIT Subsidiary

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Area of a real estate property.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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-Name Accounting Standards Codification

-Topic 272

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of damages awarded to the plaintiff in the legal matter.

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The number of businesses acquired by the entity during the period.

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The number of real estate properties owned as of the balance sheet date.

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Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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Price of a single share of a number of saleable stocks of a company.

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Number of new stock issued during the period.

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Description of Business and Organization Narrative (Details) (USD $)	0 Months Ended	9 Months Ended	12 Months Ended		0 Months Ended
	Oct. 06, 2013 entity	Oct. 06, 2013	Dec. 31, 2014 sqft entity	Dec. 31, 2012	Sep. 28, 2012
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			10,000,000us-gaap_AreaOfRealEstateProperty
Operating partnership units issued during period	$ 2,800,000,000
OP units owned by the Company, percent			40.10%
Number of entities to be treated as taxable REIT subsidiary			2
Contributions		8,223,000		2,107,000
Number of entities acquired	4us-gaap_NumberOfBusinessesAcquired
Predecessor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			380,000
Contributions		8,223,000		2,107,000
Predecessor [Member] \| New York State Supreme Court, New York County [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Damages awarded					55,000,000
Percent of damages awarded required to be in cash					80.00%
Maximum percent of freely-tradable common stock or partnership units					20.00%
Contributions					55,000,000
Secured Revolving and Term Credit Facility [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Current borrowing capacity	800,000,000.0	800,000,000.0	800,000,000.0
Maximum borrowing capacity	1,250,000,000.00	1,250,000,000.00	1,250,000,000.00
Accredited Investor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Operating partnership units issued during period (in shares)	149,000,000
Operating partnership units issued during period	2,100,000,000
Non-accredited Prior Investors [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Operating partnership units issued during period	$ 733,300,000
Common Class A [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Common Stock (in shares)	82,200,000
Share price (in dollars per share)	$ 13.00	$ 13.00
Common Class A [Member] \| Accredited Investor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Common Stock (in shares)	12,100,000
Common Class B [Member] \| Accredited Investor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Common Stock (in shares)	1,100,000
Office Building [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			9,300,000
Number of properties			14
Office Building [Member] \| Manhattan [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			7,400,000
Number of properties			9
Office Building [Member] \| Fairfield County, Connecticut and Westchester County, New York [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			1,900,000
Number of properties			5
Retail Site [Member] \| Manhattan and Westport, Connecticut [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			204,175
Retail Site [Member] \| Manhattan [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			523,463
Number of properties			4
Retail Site [Member] \| Westport, Connecticut [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties			2
Other Property [Member] \| Stamford, Connecticut [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			380,000
Consolidated Properties [Member] \| Development Parcel [Member] \| Predecessor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties			1