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General - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Finite Lived Intangible Assets [Line Items] |  |  |
Provision for asset impairment |  | $ 97,631 | $ 0
Foundations |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Provision for asset impairment | $ 97,600 | 97,600 |
Impairment provision for tradename intangible asset | 74,900 | 74,900 |
Impairment charges for real property assets | $ 22,700 | $ 22,700 |

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