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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,629,719	$ 1,376,430
Accumulated depreciation and amortization	(908,027)	(758,691)
Property and equipment, net	721,692	617,739
Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	838,301	670,059
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	472,952	415,947
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	307,812	279,621
Equipment under capital leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,654	$ 10,803
Minimum [Member] | Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	3 years
Minimum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	1 year
Minimum [Member] | Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	1 year
Minimum [Member] | Equipment under capital leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	3 years
Maximum [Member] | Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	10 years
Maximum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	15 years
Maximum [Member] | Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	10 years
Maximum [Member] | Equipment under capital leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life, years	5 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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