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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
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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

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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