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Nature of Business and Summary of Significant Accounting Policies - Net 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 | $ 182,762 | $ 162,106
Less: accumulated depreciation and amortization | (102,534) | (83,156)
Property and equipment, net | 80,228 | 78,950
Computer and office equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 123,804 | 105,692
Computer and office equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant & equipment useful lives | 3 years |
Computer and office equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant & equipment useful lives | 5 years |
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant & equipment useful lives | Lesser of useful life of improvement or remaining life of lease |
Property and equipment, gross | $ 32,364 | 33,093
Furniture and fixtures |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant & equipment useful lives | 7 years |
Property and equipment, gross | $ 12,158 | 11,145
Building and improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 12,651 | 10,391
Building and improvements | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant & equipment useful lives | 7 years |
Building and improvements | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant & equipment useful lives | 30 years |
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant & equipment useful lives | Non depreciable |
Property and equipment, gross | $ 1,785 | $ 1,785

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- 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 + Details
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 + Details
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