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Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets / Contractual Rights $ 1,712,576 $ 1,712,576
Accumulated Amortization (1,279,569) (1,244,069)
Intangible Assets, Net $ 433,007 $ 468,507