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v3.20.2

Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Sep. 30, 2020 USD ($) JointVenture | Dec. 31, 2019 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |
Maximum exposure to losses associated with VIEs | $ |  |  |  |  | $ 96.7 | $ 114.0
Common share dividend declared per share | $ / shares | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  |
Accounting Standards Update [Extensible List] |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |
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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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