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Investments - Investments in Variable Interest Entities (Detail) - Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Investment $ 3,540,000 $ 4,608,000
Maximum Exposure to Loss $ 4,520,000 $ 5,588,000