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Investment in Unconsolidated Ventures - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Investment in unconsolidated ventures $ 831us-gaap_PaymentsToAcquireInterestInJointVenture $ 4,293us-gaap_PaymentsToAcquireInterestInJointVenture
Distributions of return on investments and earnings $ 3,500for_DistributionsOfReturnOnInvestmentsAndEarnings $ 1,173for_DistributionsOfReturnOnInvestmentsAndEarnings
Equity Method Investments [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of ventures under ownership interest using equity method 15us-gaap_NumberOfRealEstateProperties
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityMethodInvestmentsMember