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2016 Management Internalization - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 20, 2016 | Dec. 31, 2016 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Net assets acquired |  |  | $ 86,723
Management internalization expense | $ 2,119 | $ 44,976 |
Management Internalization |  |  |
Business Acquisition [Line Items] |  |  |
Present value of unfavorable difference between actual and potential payment based on agreements. | 43,000 |  |
Net assets acquired | 143 |  |
Consideration transferred | 43,000 |  |
Business acquisition loss recognized amount | $ 42,857 |  |

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