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Lease Agreements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Base rent (including straight-line rent) $ 164,599us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue $ 159,898us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue $ 152,777us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue
Expense recoveries 32,132us-gaap_TenantReimbursements 30,949us-gaap_TenantReimbursements 30,391us-gaap_TenantReimbursements
Percentage rent $ 1,492us-gaap_PercentageRent $ 1,575us-gaap_PercentageRent $ 1,545us-gaap_PercentageRent