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FacilitySource Acquisition - Summary of Excess Purchase Price Over Estimated Fair Value of Net Assets Acquired (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 12, 2018 | Dec. 31, 2017
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Business Acquisition [Line Items] |  |  |
Excess purchase price over estimated fair value of net assets acquired | $ 3,643,143 |  | $ 3,254,740
FacilitySource [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Estimated purchase price |  | $ 265,465 |
Less: Estimated fair value of net assets acquired (see table below) |  | (47,118) |
Excess purchase price over estimated fair value of net assets acquired |  | $ 218,347 |

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