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Revolving Credit Facilities and Term Loans - Information Regarding Company's Revolving Credit Facilities, Term Loans (Detail) (USD $)			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities LLC [Member]	Sep. 30, 2013 Unsecured revolving credit facility with PNC Bank National Association [Member]	Sep. 30, 2013 Unsecured Term Loan - Tranche 1 [Member]	Sep. 30, 2013 Unsecured Term Loan- Tranche 2 [Member]	Sep. 30, 2013 Secured Term Loan with Key Bank National Association [Member]
Debt Instrument [Line Items]
Carrying Value			$ 42,900,000	$ 0
Unsecured term loan	350,000,000	350,000,000			50,000,000	300,000,000
Secured term loan	$ 400,000,000	$ 400,000,000					$ 400,000,000
Weighted Average Interest Rate			2.20%
Term Loan					2.30%	3.40%	2.00%
Maturity Date			Apr. 30, 2017	Apr. 30, 2017
Term loan maturity date					Jan. 31, 2017	Jan. 31, 2019	Apr. 30, 2017

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.22(a)(2))

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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-Publisher FASB

-Name Accounting Standards Codification

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The effective interest rate at the end of the reporting period.

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Weighted average interest rate of long-term debt outstanding.

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No definition available.

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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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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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