Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Company's Investments in Real Estate (Detail)

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Real Estate and Intangible Assets - Company's Investments in Real Estate (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Real estate:    
Land $ 88,394us-gaap_Land $ 79,153us-gaap_Land
Building and improvements 593,155us-gaap_InvestmentBuildingAndBuildingImprovements 527,230us-gaap_InvestmentBuildingAndBuildingImprovements
Tenant improvements 41,016us-gaap_TenantImprovements 35,970us-gaap_TenantImprovements
Accumulated depreciation (92,133)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation (81,241)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Total real estate, net $ 630,432us-gaap_RealEstateInvestmentPropertyNet $ 561,112us-gaap_RealEstateInvestmentPropertyNet