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Investments in Unconsolidated Entities - Schedule of Cumulative Investment in Entities on Equity Method, Including Share of Earnings and Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Investments in unconsolidated entities $ 5,410 $ 5,870
Limited Liability Company Interests [Member]    
Schedule of Investments [Line Items]    
Investments in unconsolidated entities 2,701 2,687
General Partnership Interests [Member]    
Schedule of Investments [Line Items]    
Investments in unconsolidated entities $ 2,709 $ 3,183