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Fair Value Measurements - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Intangible asset impairment |  | $ 89,037,000 |  |
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date | $ 92,624,000 |  | $ 92,624,000 |
Percentage of remeasuring investment in previously unconsolidated subsidiary | 50.00% |  | 50.00% |
Remaining controlling interest acquired percentage | 50.00% |  | 50.00% |
Fair value of investment in unconsolidated subsidiary at acquisition date |  |  | $ 110,100,000 |
4.875% Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate of long-term debt |  | 4.875% |  | 4.875%
5.25% Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate of long-term debt |  | 5.25% |  | 5.25%
Estimated Fair Value [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Senior term loans |  | $ 734,000,000.0 |  | $ 757,000,000.0
Estimated Fair Value [Member] | 4.875% Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Senior notes |  | 671,700,000 |  | 616,400,000
Estimated Fair Value [Member] | 5.25% Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Senior notes |  | 477,800,000 |  | 443,700,000
Actual Carrying Value [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Senior term loans |  | 731,800,000 |  | 751,300,000
Actual Carrying Value [Member] | 4.875% Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Senior notes |  | 593,400,000 |  | 592,800,000
Actual Carrying Value [Member] | 5.25% Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Senior notes |  | 422,900,000 |  | $ 422,700,000
Previously Unconsolidated Subsidiary [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date | $ 92,600,000 |  | $ 92,600,000 |
Fair Value Measurements, Non-recurring [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Assets, fair value disclosure, nonrecurring |  | 0 |  |
Liabilities, fair value disclosure, nonrecurring |  | 0 |  |
Intangible asset impairment |  | $ 89,037,000 |  |

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