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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
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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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