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Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 $ / shares | Sep. 30, 2017 USD ($) JointVenture $ / shares | Sep. 30, 2016 $ / shares | Dec. 31, 2016 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |
Maximum exposure to losses associated with VIEs | $ | $ 334.0 |  | $ 334.0 |  | $ 405.4
Common share dividends declared per share | $ / shares | $ 0.19 | $ 0.19 | $ 0.57 | $ 0.57 |
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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