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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable business segments | segment | 5 |  |
Research and development costs related to software development | $ 14,900 | $ 17,500 | $ 19,500
Advertising costs | 14,800 | 15,900 | 18,200
Provision for doubtful accounts | $ 15,386 | 8,912 | 15,564
Forgivable loans, forgiveness period, minimum | 1 year |  |
Forgivable loans, forgiveness period, maximum | 10 years |  |
Definite-lived intangible assets amortization period | 13 years 7 months 6 days |  |
Unamortized capitalized software cost | $ 14,800 | 16,600 |
Amortization of capitalized software cost | 6,700 | 12,000 | $ 6,500
Deferred rent | $ 43,900 | $ 41,900 |
Minimum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Definite-lived intangible assets amortization period | 1 year |  |
Maximum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Definite-lived intangible assets amortization period | 15 years |  |
Lease provisions for renewal options (In years) | 5 years |  |
Furniture, Equipment, And Internal-Use Software | Minimum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 3 years |  |
Furniture, Equipment, And Internal-Use Software | Maximum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 7 years |  |
Software and Software Development Costs |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 3 years |  |
Geographic Concentration Risk | Consolidated Revenues | Non U.S |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue from the work of professionals | 30.00% |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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