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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Detail) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other intangible assets, net of accumulated amortization of $1,229,297 and $1,180,393 at March 31, 2019 and December 31, 2018, respectively | $ 1,338,646 | $ 1,441,308
Other intangible assets, Total Impairment Charges | 89,000 |
Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other intangible assets, net of accumulated amortization of $1,229,297 and $1,180,393 at March 31, 2019 and December 31, 2018, respectively | 16,000 |
Other intangible assets, Total Impairment Charges | 89,037 |
Fair Value, Measurements, Nonrecurring [Member] | Level3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other intangible assets, Fair Value Measured and Recorded Using | $ 16,000 |

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