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Segment Information - Summary of Financial Information by Operating Segment, Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Assets	$ 6,833,228	$ 6,879,142
U.S. Facilities [Member] | Operating Segment [Member]
Assets:
Assets	4,102,085	4,037,968
U.K. Facilities [Member] | Operating Segment [Member]
Assets:
Assets	2,436,753	2,610,357
Corporate and Other [Member] | Corporate Reconciling Items and Eliminations [Member]
Assets:
Assets	$ 294,390	$ 230,817

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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