Date when debt instrument is scheduled to be paid.

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Debt instrument maturity month and year.

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The amount of the extended additional maturity period for the revolving credit facility.

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Gross fees paid for revolving credit facilities and term loans.

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Notes issued which may not be redeemed prior to maturity and will not be subject to any sinking fund requirements.

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Redemption senior unsecured notes make whole amount.

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

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No definition available.

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Amount of assets pledged to secure a debt instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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://www.xbrl.org/2003/role/presentationRef
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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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Face (par) amount of debt instrument at time of issuance.

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

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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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Weighted average interest rate of debt outstanding.

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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.

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

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Unsecured and Secured Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Repayment of senior notes	$ 958,509	$ 240,000	$ 502,996
Senior notes, Weighted Average Interest Rate	4.20%	4.90%
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, 2017 and 2016, the Company was in compliance with all of the financial and other covenants under the indentures.
Payment of debt issuance costs	$ 7,295	$ 43	4,605
Gross fees paid for revolving credit facilities and term loans	1,900	$ 1,800	$ 2,300
Mortgage Payable [Member]
Debt Instrument [Line Items]
Net book value of investments and real estate collateralizing mortgages payable	$ 900,000
Mortgage Payable [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate	3.40%
Mortgage Payable [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate	9.80%
Senior Notes [Member]
Debt Instrument [Line Items]
Payment of debt issuance costs	$ 2,000
Unsecured Debt [Member] \| Wells Fargo Bank National Association and PNC Bank National Association [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Unsecured term loan	$ 400,000
Covenant compliance	Company was in compliance with these financial covenants at December 31, 2017 and 2016
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%
3.9% Senior Unsecured Notes Due August 2024 [Member]
Debt Instrument [Line Items]
Senior notes issued	$ 350,000
Debt Instrument, Interest Rate	3.90%
Debt instrument maturity date	2024-08
4.7% Senior Unsecured Notes Due June 2027 [Member]
Debt Instrument [Line Items]
Senior notes issued	$ 450,000
Debt Instrument, Interest Rate	4.70%
Debt instrument maturity date	2027-06
7.875% Senior Unsecured Notes Due September 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate	7.875%
Debt instrument maturity date	2020-09
Repayment of senior notes	$ 300,000
4.75% Senior Unsecured Notes Due April 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate	4.75%
Debt instrument maturity date	2018-04
Repayment of senior notes	$ 300,000
7.875% Senior Unsecured Notes Due September 2020 and 4.75% Senior Unsecured Notes Due April 2018 [Member]
Debt Instrument [Line Items]
Payment on redemption of senior notes	$ 58,500
Senior Unsecured Notes due July 2018 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2018-07
Senior notes issued which may not be redeemed prior to maturity	$ 82,200
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]
Unsecured term loan	$ 200,000
Term loan maturity date	2018-04
Extension maturity period	with two one-year extension options
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]
Unsecured term loan	$ 200,000
Term loan maturity date	2023-01
Secured Term Loan with Key Bank National Association [Member]
Debt Instrument [Line Items]
Covenant compliance	The Company was in compliance with these financial covenants at December 31, 2016.
Secured Term Loan with Key Bank National Association [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Specified spread line of credit facility		1.35%