Segment Information - Summary of Financial Information by Operating Segment, Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	$ 3,151,739	$ 3,224,034
Operating Segment [Member] | U.S. Facilities [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	1,500,000	1,400,000
Operating Segment [Member] | U.K. Facilities [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	1,600,000	1,700,000
Corporate Reconciling Items and Eliminations [Member] | Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	$ 57,300	$ 50,900