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Other Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Deferred Costs, Capitalized and Other Assets Disclosure [Line Items]
Leasing commissions, accumulative amortization	$ 17,882	$ 16,829
Lease incentives, accumulated amortization	2,313	2,220
Other intangible assets, accumulated amortization	4,316	4,239
Debt issuance costs, accumulated amortization	$ 2,629	$ 2,374

For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income.

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