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Segment Reporting and Information about Geographic Areas - Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived Assets $ 16,283,162 $ 17,601,473
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived Assets 15,620,488 16,741,409
International [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived Assets $ 662,674 $ 860,064