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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, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Investments in unconsolidated entities $ 17,546 $ 18,999
Limited Liability Company Interests [Member]    
Schedule of Investments [Line Items]    
Investments in unconsolidated entities 14,327 15,739
General Partnership Interests [Member]    
Schedule of Investments [Line Items]    
Investments in unconsolidated entities $ 3,219 $ 3,260