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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Significant Accounting Policies [Line Items]      
Amortization expense for intangible assets $ 1,909us-gaap_AmortizationOfIntangibleAssets $ 729us-gaap_AmortizationOfIntangibleAssets  
Amortization expense for intangible assets expected for remainder of 2015 1,342us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Depreciation expense 4,129us-gaap_Depreciation 2,123us-gaap_Depreciation  
Mortgage indebtedness, carrying amount 422,613us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages   400,509us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Building and Building Improvements      
Significant Accounting Policies [Line Items]      
Depreciable Lives 40 years    
Equipment and Fixtures | Minimum      
Significant Accounting Policies [Line Items]      
Depreciable Lives 5 years    
Equipment and Fixtures | Maximum      
Significant Accounting Policies [Line Items]      
Depreciable Lives 10 years    
Mortgages      
Significant Accounting Policies [Line Items]      
Mortgage indebtedness, carrying amount 422,613us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
  400,509us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Indebtedness fair value $ 439,571us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
  $ 411,311us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember