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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,376,430	$ 1,285,201
Accumulated depreciation and amortization	(758,691)	(724,445)
Property and equipment, net	617,739	560,756
Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	670,059	683,738
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	415,947	342,940
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	279,621	247,768
Equipment under capital leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,803	$ 10,755
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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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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

No definition available.

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