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FacilitySource Acquisition - Summary of Excess Purchase Price Over Estimated Fair Value of Net Assets Acquired (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 12, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Excess purchase price over estimated fair value of net assets acquired	$ 3,652,309		$ 3,254,740	$ 2,981,392
FacilitySource [Member]
Business Acquisition [Line Items]
Estimated purchase price		$ 266,465
Add: Estimated fair value of net liabilities assumed (see table below)		8,632
Excess purchase price over estimated fair value of net assets acquired		$ 275,097

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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