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Assets and Liabilities Held for Sale - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) on sale of business |  |  |  | $ (4,970) |  |
Foreign currency translation adjustments gain (loss) |  | $ 14,857 | $ 3,266 | 15,454 | $ 14,519 |
GPT |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment loss recognized on assets held for sale |  | 18,910 |  | 18,910 |  | $ 2,190
Impairment loss on equity investment |  | 0 |  | 4,486 |  |
Impairment losses on asset held for sale |  | $ 837 |  | $ 16,720 |  |
GPT | Scenario Forecast |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) on sale of business | $ 6,000 |  |  |  |  |
Foreign currency translation adjustments gain (loss) | $ 4,000 |  |  |  |  |

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