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Intangible Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]          
Definite-lived asset useful life 9 years        
Gain on sale of intangible assets $ 15,000 $ 20,000 $ 15,000 $ 20,000  
Intangible assets:          
Finite-lived intangible assets 640,125   640,125   $ 307,995
Indefinite-lived intangible assets 0   0   326,359
Gross intangible assets: 640,125   640,125   634,354
Less: Accumulated amortization (163,493)   (163,493)   (142,546)
Net carrying value 476,632   476,632   $ 491,808 [1]
Restatement Adjustment          
Intangible assets:          
Finite-lived intangible assets 326,400   326,400    
Indefinite-lived intangible assets $ (326,400)   $ (326,400)    
[1]
December 31, 2018 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on February 28, 2019.