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Investments in Other Entities (Condensed Consolidated Balance Sheet) (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Assets    
Land and Building $ 13,297,168 $ 13,814,306
Total assets 510,977,108 490,635,793
Liabilities and Members' Equity    
Total liabilities and members' equity 510,977,108 $ 490,635,793
W College LLC [Member]    
Assets    
Land and Building 33,347,679  
Total assets 33,347,679  
Liabilities and Members' Equity    
Members' equity 33,347,679  
Total liabilities and members' equity $ 33,347,679