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Real Estate and Accumulated Depreciation - Changes in Total Real Estate Investments and Related Accumulated Depreciation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total real estate investments:
Balance, beginning of year	$ 1,459,439us-gaap_RealEstateInvestmentPropertyAtCost	$ 1,466,068us-gaap_RealEstateInvestmentPropertyAtCost	$ 1,417,845us-gaap_RealEstateInvestmentPropertyAtCost
Acquisitions	70,921us-gaap_RealEstateOtherAcquisitions	5,124us-gaap_RealEstateOtherAcquisitions	34,247us-gaap_RealEstateOtherAcquisitions
Improvements	34,417us-gaap_RealEstateImprovements	21,991us-gaap_RealEstateImprovements	23,095us-gaap_RealEstateImprovements
Retirements	(4,618)us-gaap_RealEstateOtherDeductions	(33,744)us-gaap_RealEstateOtherDeductions	(9,119)us-gaap_RealEstateOtherDeductions
Balance, end of year	1,560,159us-gaap_RealEstateInvestmentPropertyAtCost	1,459,439us-gaap_RealEstateInvestmentPropertyAtCost	1,466,068us-gaap_RealEstateInvestmentPropertyAtCost
Total accumulated depreciation:
Balance, beginning of year	364,663us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	353,305us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	326,397us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Depreciation expense	35,933us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	43,204us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	34,565us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Retirements	(3,979)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions	(31,846)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions	(7,657)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions
Balance, end of year	$ 396,617us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	$ 364,663us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	$ 353,305us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation

X

- Definition

Amount of other deductions to accumulated depreciation, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

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-Publisher FASB

-Name Accounting Standards Codification

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The cumulative amount of depreciation for real estate property held for investment purposes.

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- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of other deductions to real estate investments, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate.

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-Publisher FASB

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