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Fair Value - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
community_development_project
multifamily_site
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairments $ 60,939 $ 108,184 $ 15,934
Impairment of oil and gas properties   107,140  
Impairment of leasehold   57,691  
Real Estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairments   $ 1,044  
Real Estate Impairment Charges      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairments $ 56,453    
Community Development Project      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of properties impaired | community_development_project 6    
Multifamily Site      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of properties impaired | multifamily_site 2    
Oil and Gas Properties      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of assets to be disposed of $ 612    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Community Development Project      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of properties impaired | community_development_project 4    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Multifamily Site      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of properties impaired | multifamily_site 1