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Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) JointVenture $ / shares | Mar. 31, 2016 $ / shares | Dec. 31, 2016 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |
Maximum exposure to losses associated with VIEs | $ | $ 329.5 |  | $ 405.4
Common share dividends declared per share | $ / shares | $ 0.19 | $ 0.19 |
Percentage of lease commission income upon lease execution | 50.00% |  |
Percentage of lease commission income upon tenant rent commencement | 50.00% |  |
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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