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Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Jun. 30, 2020 USD ($) JointVenture | Dec. 31, 2019 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |
Maximum exposure to losses associated with VIEs | $ |  |  |  | $ 89.6 | $ 114.0
Common share dividend declared per share | $ / shares | $ 0.20 | $ 0.20 | $ 0.20 |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |
Number of unconsolidated joint ventures | JointVenture |  |  |  | 2 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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