Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Debt Instrument, Yield to Maturity

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Interest rate of interest rate derivative instrument.

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Maturity date of interest rate swap

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Maximum percentage of unencumbered assets.

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Percentage of dividends payable on basis of adjusted operating funds.

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Percentage of dividends payable on senior unsecured notes.

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Portion of debt instrument face amount.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

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

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- Definition

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

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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

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Amount of the required periodic payments of both interest and principal.

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The fair value, as of the date of each statement of financial position presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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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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Debt - Additional Information (Detail) (USD $)	9 Months Ended						3 Months Ended	1 Months Ended	3 Months Ended			3 Months Ended			1 Months Ended
Debt - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012	Sep. 30, 2013 Interest Rate Contract	Dec. 31, 2012 Interest Rate Contract	Jun. 30, 2010 Interest Rate Contract One	Oct. 31, 2011 Interest Rate Contract Two	Jun. 30, 2010 2006 Senior Unsecured Notes	Sep. 30, 2013 2006 Senior Unsecured Notes	Dec. 31, 2012 2006 Senior Unsecured Notes	Mar. 09, 2012 2012 Term Loan	Mar. 09, 2012 2012 Term Loan Revolving Credit Facility Minimum	Mar. 09, 2012 2012 Term Loan Revolving Credit Facility Maximum	Aug. 20, 2013 Senior Notes Six Point Three Seven Five Percent Due Two Thousand Twenty Two [Member]	Feb. 17, 2012 Senior Notes Six Point Three Seven Five Percent Due Two Thousand Twenty Two [Member]
Debt Instrument [Line Items]
Unsecured senior notes, value of offering															$ 150,000,000	$ 200,000,000
Net proceeds, after underwriting discount															150,300,000	196,500,000
Unsecured senior notes, interest rate															6.375%	6.375%
Debt instrument redumption price															102.00%	102.00%
Debt instrument yield to maturity															5.998%	5.998%
Debt instrument maturity date															Feb. 15, 2020	Feb. 15, 2020
Paid off term loan												100,000,000
Debt instrument face amount										125,000,000	125,000,000	70,000,000
Credit facilities, amount outstanding													330,000,000	400,000,000
Portion of debt instrument face amount									65,000,000
Fair value of the interest rate swaps					9,700,000	12,500,000
Interest rate of interest rate derivative instrument							5.507%
Maturity date of interest rate swap							July 2016	October 2016
Interest rate swap, amount fixed								60,000,000
Interest rate of derivative instrument								5.675%
Other assets, collateral	$ 4,700,000			$ 6,600,000
Percentage of dividends which could be paid from adjusted operating funds	95.00%
Percentage of dividends which could be paid from operation funds		95.00%
Maximum percentage of total unencumbered assets		150.00%	150.00%