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FacilitySource Acquisition - Summary of Preliminary Estimate of Amortizable Intangible Assets and Depreciable Computer Software Acquired (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 12, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 1,147,504 |  | $ 1,000,738
Property and equipment, net | $ 702,428 |  | $ 617,739
FacilitySource [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted Average Amortization Period, Intangibles | 14 years 8 months 12 days |  |
Amount Assigned at Acquisition Date, Total amortizable intangible assets acquired |  | $ 64,400 |
Amount Assigned at Acquisition Date, Property and Equipment |  | 54,730 |
Other intangible assets, accumulated amortization | $ 1,348 |  |
Total amortizable intangible assets acquired, Net Carrying Value | $ 63,052 |  |
FacilitySource [Member] | Trade name [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted Average Amortization Period, Intangibles | 20 years |  |
Amount Assigned at Acquisition Date, Total amortizable intangible assets acquired |  | 38,950 |
Other intangible assets, accumulated amortization | $ 568 |  |
Total amortizable intangible assets acquired, Net Carrying Value | $ 38,382 |  |
FacilitySource [Member] | Customer relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted Average Amortization Period, Intangibles | 6 years 8 months 1 day |  |
Amount Assigned at Acquisition Date, Total amortizable intangible assets acquired |  | 25,450 |
Other intangible assets, accumulated amortization | $ 780 |  |
Total amortizable intangible assets acquired, Net Carrying Value | $ 24,670 |  |
FacilitySource [Member] | Computer software [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted Average Depreciation Period, Property and Equipment | 10 years |  |
Amount Assigned at Acquisition Date, Property and Equipment |  | $ 51,850 |
Accumulated Amortization and Depreciation, Property and Equipment | $ 1,512 |  |
Property and equipment, net | $ 50,338 |  |

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