Debt instrument maturity month and year.

No definition available.

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- Definition

Gross fees paid for revolving credit facilities and term loans.

+ References

No definition available.

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- Definition

Redemption senior unsecured notes make whole amount.

+ References

No definition available.

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- Definition

Repayment of unsecured term loan.

+ References

No definition available.

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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.

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

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- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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- Definition

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

+ References

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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.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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- Definition

Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

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Unsecured and Secured Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2018
Debt Instrument [Line Items]
Repayment of senior notes	$ 1,206,619	$ 958,509	$ 240,000
Repayment of mortgage debt	$ 1,006,065	542,486	195,495
Covenant terms	The fixed-rate senior notes were issued pursuant to indentures that contain certain covenants, including limitation on incurrence of debt, maintenance of unencumbered real estate assets and debt service coverage. The covenants also require that the cumulative dividends declared or paid from December 31, 1993, through the end of the current period cannot exceed Funds From Operations (as defined in the agreement) plus an additional $20.0 million for the same period unless required to maintain REIT status
Covenant compliance	At December 31, 2018 and 2017, the Company was in compliance with all of the financial and other covenants under the indentures.
Payment of debt issuance costs	$ 32,825	7,295	43
Mortgage debt	88,743	641,082
Gross fees paid for revolving credit facilities and term loans	2,700	1,900	$ 1,800
Mortgage Payable [Member]
Debt Instrument [Line Items]
Net book value of investments and real estate collateralizing mortgages payable	$ 143,000,000
Mortgage Payable [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate	4.70%
Mortgage Payable [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate	6.80%
Mortgages indebtedness [Member]
Debt Instrument [Line Items]
Repayment of mortgage debt	$ 550,900
Mortgage debt	88,700	$ 641,100
Unsecured Debt [Member]
Debt Instrument [Line Items]
Repayment of unsecured term loan	$ 350,000
Unsecured Debt [Member] \| Wells Fargo Bank National Association and PNC Bank National Association [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Covenant compliance	Company was in compliance with these financial covenants at December 31, 2018 and 2017
Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, Weighted Average Interest Rate	4.20%	4.20%
Payment of debt issuance costs		$ 2,000
Senior Unsecured Notes with Maturity Dates Ranging from July 2018 to February 2025 [Member] \| Promissory Notes [Member]
Debt Instrument [Line Items]
Repayment of senior notes	$ 1,172,200
Payment on redemption of senior notes	37,200
Tranche A Loans [Member] \| Unsecured Debt [Member] \| Wells Fargo Bank National Association and PNC Bank National Association [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Repayment of unsecured term loan	200,000
Tranche B Loans [Member] \| Unsecured Debt [Member] \| Wells Fargo Bank National Association and PNC Bank National Association [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Repayment of unsecured term loan	$ 150,000
Term loan maturity date	2023-01
Unsecured term loan	$ 50,000
Tranche B Loans [Member] \| Unsecured Debt [Member] \| Wells Fargo Bank National Association and PNC Bank National Association [Member] \| Term Loan [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Specified spread line of credit facility	1.35%
Loan Agreement [Member] \| Promissory Notes [Member]
Debt Instrument [Line Items]
Mortgage debt				$ 1,350,000