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Prepaid Expenses and Other Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Costs, Capitalized and Other Assets Disclosure [Line Items]
Leasing commissions, accumulative amortization	$ 16,829	$ 13,015
Lease incentives, accumulated amortization	2,220	1,850
Other intangible assets, accumulated amortization	4,239	3,848
Debt issuance costs, accumulated amortization	$ 2,374	$ 2,188

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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