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Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) JointVenture | Dec. 31, 2016 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |
Maximum exposure to losses associated with VIEs | $ | $ 325.3 | $ 405.4
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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