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Future Rental Revenues - Minimum Lease Payments Receivable, Excluding Tenant Reimbursements of Expenses, Under Non-Cancelable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Contractual Minimum Rental Revenues On Leases [Line Items]
2013	$ 239,906
2014	200,280
2015	163,521
2016	126,950
2017	99,841
Thereafter	346,529
Total	$ 1,177,027

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the third year from the balance sheet date under an operating lease.

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Future rental payments receivable within the second year from the balance sheet date under an operating lease.

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Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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