Contractual base cash payments accrued.

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- Definition

Liquidation value of property.

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No definition available.

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- Definition

Net proceeds from sale of real estate.

+ References

No definition available.

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- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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-Name Accounting Standards Codification
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

+ References

No definition available.

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- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

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-Name Accounting Standards Codification
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- Definition

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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No definition available.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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Real Estate Investments - Additional Information (Detail) - Liquidation Value [Member] - USD ($) $ in Millions										3 Months Ended
	Mar. 15, 2018	Feb. 16, 2018	Feb. 15, 2018	Feb. 14, 2018	Feb. 06, 2018	Jan. 25, 2018	Jan. 22, 2018	Jan. 10, 2018	Jan. 05, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Real Estate Properties [Line Items]
Contractual base cash payments, excluding reimbursements accrued										$ 0.6
333 West 34th Street [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property									$ 255.0
Aggregate face amount									760.0
Payment of debt									110.6
Net proceeds from payment of debt									$ 134.6
Liquidation value of property												$ 255.0
One Jackson Sq [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property					$ 31.0
Aggregate face amount					760.0
Payment of debt					13.0
Net proceeds from payment of debt					$ 16.5
Liquidation value of property												31.0
350 West 42nd Street [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property								$ 25.1
Aggregate face amount								760.0
Payment of debt								11.3
Net proceeds from payment of debt								$ 12.6
Liquidation value of property												25.1
306 East 61st Street [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property		$ 47.0
Net proceeds from payment of debt		26.5
Liquidation value of property		47.0
306 East 61st Street [Member] \| Mortgages [Member]
Real Estate Properties [Line Items]
Aggregate face amount		$ 19.0
2091 Coney Island Avenue [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property				$ 3.8
Payment of debt				4.4
Liquidation value of property												3.8
416 Washington Street [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property							$ 11.2
Net proceeds from payment of debt							$ 5.1
Liquidation value of property										11.2		11.2
Sale completion date							Apr. 19, 2018
416 Washington Street [Member] \| Mortgages [Member]
Real Estate Properties [Line Items]
Aggregate face amount							$ 760.0
Payment of debt							$ 5.5
2067 - 2073 Coney Island Avenue [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property						$ 30.5
Liquidation value of property										30.5		30.5
350 Bleecker Street [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property			$ 31.5
Liquidation value of property										31.5		31.5
Sale completion date			Apr. 19, 2018
Net proceeds from sale of property			$ 8.8
350 Bleecker Street [Member] \| Mortgages [Member]
Real Estate Properties [Line Items]
Aggregate face amount			760.0
Payment of debt			$ 21.1
Centurion Parking Garage [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 3.5
Liquidation value of property										$ 3.5		$ 3.5
Customer Concentration Risk [Member] \| Sales Revenue, Services, Net [Member] \| Minimum [Member]
Real Estate Properties [Line Items]
Major tenant rental income, as a percentage of total annualized rental income										10.00%	10.00%
1100 Kings Highway [Member] \| 2091 Coney Island Avenue [Member] \| Mortgages [Member]
Real Estate Properties [Line Items]
Aggregate face amount				$ 20.2
1100 Kings Highway [Member] \| 2067 - 2073 Coney Island Avenue [Member] \| Mortgages [Member]
Real Estate Properties [Line Items]
Aggregate face amount						$ 20.2