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FacilitySource Acquisition - Summary of Preliminary Estimate of Amortizable Intangible Assets and Depreciable Computer Software Acquired (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jun. 12, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 1,180,393 |  | $ 1,000,738
Accumulated Amortization and Depreciation, Property and Equipment | 908,027 |  | 758,691
Property and equipment, net | 721,692 |  | 617,739
Customer relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 435,225 |  | $ 355,642
FacilitySource [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted Average Amortization Period, Intangibles | 16 years 11 months 15 days |  |
Amount Assigned at Acquisition Date, Total amortizable intangible assets acquired |  | $ 48,200 |
Amount Assigned at Acquisition Date, Property and Equipment |  | 41,680 |
Other intangible assets, accumulated amortization | $ 1,901 |  |
Total amortizable intangible assets acquired, Net Carrying Value | $ 46,299 |  |
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 |  | 37,200 |
Other intangible assets, accumulated amortization | $ 1,007 |  |
Total amortizable intangible assets acquired, Net Carrying Value | $ 36,193 |  |
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 |  | 11,000 |
Other intangible assets, accumulated amortization | $ 894 |  |
Total amortizable intangible assets acquired, Net Carrying Value | $ 10,106 |  |
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 |  | $ 38,800 |
Accumulated Amortization and Depreciation, Property and Equipment | $ 2,102 |  |
Property and equipment, net | $ 36,698 |  |

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