Indebtedness - Schedule of Indebtedness (Detail) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total	$ 890,292	$ 892,459
Senior Notes [Member]
Debt Instrument [Line Items]
Payment Terms	Int.
Interest Rate, minimum	3.375%
Interest Rate, maximum	4.75%
Unsecured debt	$ 400,000	400,000
Senior Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, Maturity	2017
Senior Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, Maturity	2022
Unsecured Bank Term Loan [Member]
Debt Instrument [Line Items]
Payment Terms	Int.
Interest Rate, spread over LIBOR	1.15%
Debt instrument, Maturity	2020
Unsecured debt	$ 300,000	300,000
Secured Mortgage Notes [Member]
Debt Instrument [Line Items]
Payment Terms	Prin. and Int.
Interest Rate	5.99%
Debt instrument, Maturity	2019
Mortgage note payable	$ 190,292	$ 192,459

Debt instrument maturity year.

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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

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

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

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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

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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.

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- Definition

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

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