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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Oct. 20, 2015 demolition
Loss Contingencies [Line Items] |  |  |  |
Insurance recoveries | $ 7,700 |  |  |
Income from other investments, net | 5,795 | $ 7,310 | $ 7,359 |
Settlement accrual | 8,000 |  |  |
Number of historical demolition | demolition |  |  |  | 200
Income from Other Investments |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Income from other investments, net | $ 1,300 |  |  |

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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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