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Segment Information - Summary of Financial Information by Operating Segment, Assets (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Segment Reporting Asset Reconciling Item [Line Items]    
Property and equipment, net $ 3,164,076 $ 3,107,766
Operating Segment [Member] | U.S. Facilities [Member]    
Segment Reporting Asset Reconciling Item [Line Items]    
Property and equipment, net 1,400,000 1,400,000
Operating Segment [Member] | U.K. Facilities [Member]    
Segment Reporting Asset Reconciling Item [Line Items]    
Property and equipment, net 1,700,000 1,700,000
Corporate Reconciling Items and Eliminations [Member] | Corporate and Other [Member]    
Segment Reporting Asset Reconciling Item [Line Items]    
Property and equipment, net $ 49,300 $ 44,900