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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges | $ 10,600,000 | $ 3,800,000 | $ 0 | $ 14,455,000 | $ 0
Reclassification adjustment related to derivatives from AOCI to interest expense |  |  | 2,300,000 |  |
Derivatives designated as fair value hedges | 0 |  | 0 | 0 |
Derivative designated to hedges of net investments in foreign operations | 0 |  | $ 0 | 0 |
Noncontrolling Interests |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges | $ 7,600,000 | $ 2,700,000 |  |  |
Disposal group, held-for-sale |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges |  |  |  | 10,600,000 |
Disposal group, held-for-sale | Noncontrolling Interests |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges |  |  |  | 7,600,000 |
Nonrecurring | Disposal group, held-for-sale | Property Classified As Held For Sale At September 30, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges |  |  |  | 3,800,000 |
Nonrecurring | Disposal group, held-for-sale | Property Classified As Held For Sale At December 31, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges |  |  |  | 10,600,000 |
Nonrecurring | Disposal group, held-for-sale | Noncontrolling Interests | Property Classified As Held For Sale At September 30, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges |  |  |  | 2,700,000 |
Nonrecurring | Disposal group, held-for-sale | Noncontrolling Interests | Property Classified As Held For Sale At December 31, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges |  |  |  | $ 7,600,000 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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