Additional Debt Disclosures [Abstract]

No definition available.

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- Definition

The threshold applied for the rate at which used credit facility fees will be incurred.

+ References

No definition available.

+ Details

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- Definition

The change in ownership percentage of equity investments during the period.

+ References

No definition available.

+ Details

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- Definition

Loans Defeased, Count

+ References

No definition available.

+ Details

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- Definition

The amount of loans repaid during the period.

+ References

No definition available.

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- Definition

Non Recourse Loans Acquired

+ References

No definition available.

+ Details

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- Definition

Non Recourse Mortgage Loans Paid by Buyer

+ References

No definition available.

+ Details

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- Definition

Number of Loans Acquired

+ References

No definition available.

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- Definition

Number of Loans Refinanced, Count

+ References

No definition available.

+ Details

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- Definition

The number of properties sold during the period.

+ References

No definition available.

+ Details

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- Definition

We are required to ensure that the total Restricted Payments (as defined in the Credit Agreement) in an aggregate amount in any fiscal year does not exceed the amount of Restricted Payments required in order for us to (i) maintain our REIT status and (ii) avoid the payment of federal or state income or excise tax. Restricted Payments include quarterly dividends and the total amount of shares repurchased by us, if any, in excess of $100.0 million per year.

+ References

No definition available.

+ Details

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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- Definition

Amount of the fees associated with providing collateral for the credit facility.

+ References

No definition available.

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format.

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

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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- Definition

Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

+ Details

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt - Narratives (Details)						3 Months Ended					9 Months Ended	12 Months Ended
Debt - Narratives (Details)	Jan. 22, 2018 USD ($)	Mar. 17, 2017 USD ($) property	Oct. 26, 2016	Apr. 11, 2016 property	Aug. 26, 2015 USD ($)	Jun. 30, 2017 property	Dec. 31, 2016 USD ($) property	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2017 USD ($) property loan	Dec. 31, 2016 USD ($) property loan	Dec. 31, 2015 USD ($)	Mar. 31, 2017 USD ($)
Additional Debt Disclosures
Number of loans assumed (loans) \| loan													7
Debt, weighted average interest rate							2.00%						2.00%
Payments of mortgage principal												$ 458,010,000	$ 177,469,000	$ 121,267,000
Mortgage debt, net							$ 2,022,250,000					1,849,459,000	2,022,250,000
Loss on extinguishment of debt							800,000	$ 16,000,000	$ 5,100,000	$ 2,500,000		$ 1,922,000	24,376,000	275,000
Non-recourse mortgage loans							170,900,000						$ 170,900,000
Debt instrument terms (years)													7 years 1 month 6 days
Number of real estate properties \| property												411
Line of credit, maximum borrowing capacity					$ 250,000,000
Commitment fee threshold					50.00%
Credit facility fees					$ 1,900,000
Debt and capital lease obligation							49,751,000					$ 101,931,000	$ 49,751,000
Proceeds from Senior Credit Facility												119,235,000	225,693,000	235,367,000
Repayments of Senior Credit Facility												68,990,000	289,558,000	120,400,000
Restriction payment threshold												100,000,000.0
Effects of foreign currency translation on balance sheet item												100,948,000	(18,785,000)	$ (81,037,000)
Subsequent Event
Additional Debt Disclosures
Payments of mortgage principal	$ 6,100,000
Non-recourse debt
Additional Debt Disclosures
Effects of foreign currency translation on balance sheet item												79,000,000
Revolver
Additional Debt Disclosures
Line of credit, maximum borrowing capacity					$ 200,000,000
Debt maturity date					Aug. 26, 2018
Revolver \| Accordion
Additional Debt Disclosures
Line of credit, maximum borrowing capacity					$ 250,000,000
Term Loan
Additional Debt Disclosures
Line of credit, maximum borrowing capacity					$ 50,000,000
Debt maturity date											Aug. 26, 2018
Debt and capital lease obligation							$ 49,751,000	$ 50,000,000			$ 50,000,000	$ 49,915,000	$ 49,751,000
Term Loan \| LIBOR
Additional Debt Disclosures
Basis spread											1.45%	1.45%
Self storage
Additional Debt Disclosures
Number of real estate properties \| property												37
Self storage \| Madison Storage NYC, LLC and Veritas Group IX-NYC, LLC
Additional Debt Disclosures
Debt, weighted average interest rate							4.50%						4.50%
Non-recourse mortgage loans							$ 69,800,000						$ 69,800,000
Debt instrument terms (years)													1 year 1 month 6 days
Increase in ownership equity investments			40.00%	15.00%									15.00%
Number of real estate properties \| property				5
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Additional Debt Disclosures
Mortgage debt, net															$ 31,200,000
Interest rate on debt															4.90%
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Additional Debt Disclosures
Number of real estate properties \| property							52						52
Number of properties sold \| property													34
Thirteen Properties
Additional Debt Disclosures
Payments of mortgage principal												$ 261,400,000
Loans repaid \| loan												13
I Drive Property
Additional Debt Disclosures
Loss on extinguishment of debt												$ 1,300,000
I Drive Property \| Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Additional Debt Disclosures
Number of properties sold \| property		1
I Drive Property \| Developer
Additional Debt Disclosures
Non recourse mortgage loan paid by buyer		$ 60,000,000										60,000,000
Property in Italy
Additional Debt Disclosures
Payments of mortgage principal												$ 9,300,000
Property in Italy \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Additional Debt Disclosures
Number of properties sold \| property						3
Debt Refinanced
Additional Debt Disclosures
Number of loans assumed (loans) \| loan												2
Debt, weighted average interest rate							2.00%					2.80%	2.00%
Payments of mortgage principal												$ 157,700,000
Mortgage debt, net												$ 180,000,000
Loss on extinguishment of debt													$ 800,000
Non-recourse mortgage loans							$ 211,800,000						$ 211,800,000
Debt instrument terms (years)												3 years	4 years 8 months 12 days
Mortgages
Additional Debt Disclosures
Number of loans assumed (loans) \| loan												2	2
Non recourse mortgage loans acquired												$ 25,100,000
Debt, weighted average interest rate							3.00%					3.10%	3.00%
Payments of mortgage principal													$ 206,400,000
Non-recourse mortgage loans							$ 65,900,000						$ 65,900,000
Debt instrument terms (years)												7 years	4 years 9 months 18 days
Number of loans refinanced (loans) \| loan													4
Mortgages \| Self storage
Additional Debt Disclosures
Debt, weighted average interest rate							4.90%						4.90%
Payments of mortgage principal													$ 121,900,000
Loss on extinguishment of debt													$ 23,600,000
Debt instrument terms (years)													5 years 8 months 12 days
Loans defeased, count \| loan													7
Number of real estate properties \| property							18						18
Minimum
Additional Debt Disclosures
Debt maturity date												Aug. 31, 2018
Credit facility fee, rate					0.15%
Minimum \| Revolver \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt					1.50%
Minimum \| Revolver \| Base Rate
Additional Debt Disclosures
Interest rate on debt					0.50%
Minimum \| Term Loan \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt					1.45%
Minimum \| Term Loan \| Base Rate
Additional Debt Disclosures
Interest rate on debt					0.45%
Maximum
Additional Debt Disclosures
Debt maturity date												Aug. 31, 2039
Credit facility fee, rate					0.30%
Maximum \| Revolver \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt					2.25%
Maximum \| Revolver \| Base Rate
Additional Debt Disclosures
Interest rate on debt					1.25%
Maximum \| Term Loan \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt					2.20%
Maximum \| Term Loan \| Base Rate
Additional Debt Disclosures
Interest rate on debt					1.20%
Fixed interest rate \| Minimum
Additional Debt Disclosures
Interest rate on mortgage loan												1.90%
Fixed interest rate \| Maximum
Additional Debt Disclosures
Interest rate on mortgage loan												7.40%
Variable interest rate \| Minimum
Additional Debt Disclosures
Interest rate on mortgage loan												1.30%
Variable interest rate \| Maximum
Additional Debt Disclosures
Interest rate on mortgage loan												6.00%