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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Detail) - USD ($)
$ in Thousands
 3 Months Ended
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