Details of Indebtedness (Parenthetical) (Detail) $ in Millions	Dec. 31, 2016 USD ($) Property	Dec. 31, 2015 USD ($) Property
Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Current borrowing capacity	$ 11.1	$ 20.0
Secured Mortgages and Other Notes Payable
Debt Instrument [Line Items]
Number of collateralized properties owned \| Property	75	65
Mortgages and other notes payable carrying value of collateral	$ 1,600.0	$ 1,400.0
Forward Contracts
Debt Instrument [Line Items]
Notional amounts of derivative contract		48.4
Interest Rate Swap
Debt Instrument [Line Items]
Notional amounts of derivative contract	521.5	480.7
Interest Rate Cap
Debt Instrument [Line Items]
Notional amounts of derivative contract	$ 410.0	$ 260.0

Number of collateralized properties owned as of balance sheet date.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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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.

+ References

No definition available.

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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