Debt - Unsecured Revolving Credit and Term Loan Facility (Details) - Revolving Credit Facility	1 Months Ended
Aug. 31, 2017 USD ($) option
Unsecured revolving credit facility
Debt Instrument [Line Items]
Current borrowing capacity	$ 1,100,000,000
Option to extend maturity, number \| option	2
Extension period (in months)	6 months
Maximum leverage ratio (in percentage)	60.00%
Maximum consolidated secured indebtedness to asset value (in percentage)	40.00%
Minimum tangible net worth	$ 1,200,000,000
Tangible net worth, minimum percent of net equity proceeds received (in percentage)	75.00%
Minimum adjusted EBITDA to consolidated fixed charges	1.50
Minimum net operating income to unsecured debt	1.75
Maximum ratio of unsecured debt to unencumbered asset value (in percentage)	60.00%
Term Loan
Debt Instrument [Line Items]
Current borrowing capacity	$ 265,000,000.0
Unsecured Revolving Credit Facility And Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	1,365,000,000
Credit facility higher borrowing capacity option	$ 1,750,000,000
Minimum \| Unsecured revolving credit facility
Debt Instrument [Line Items]
Extension fee percent of outstanding commitments under revolving credit facility (in percentage)	0.0625%
Maximum \| Unsecured revolving credit facility
Debt Instrument [Line Items]
Extension fee percent of outstanding commitments under revolving credit facility (in percentage)	0.075%

Debt Instrument, Option to Extend, Number

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Secured Indebtedness to Asset Value

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Leverage Ratio

+ References

No definition available.

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Ratio of Unsecured Debt to Unencumbered Asset Value

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Adjusted EBITDA to Consolidated Fixed Charges

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Net Operating Income to Unsecured Debt

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Tangible Net Worth

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Tangible Net Worth. Minimum Percent of Net Equity Proceeds Received

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Extension Fee, Percent of Outstanding Commitments Under Revolving Credit Facility

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Extension Period

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Higher Borrowing Capacity Option

+ References

No definition available.

+ Details

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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 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

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.

+ References

+ Details

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