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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, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 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 | $ 17,500 | $ 19,500 | $ 19,300
Advertising costs | 15,900 | 18,200 | 20,700
Provision for doubtful accounts | $ 8,912 | 15,564 | 18,252
Forgivable loans, forgiveness period, minimum | 1 year |  |
Forgivable loans, forgiveness period, maximum | 10 years |  |
Definite-lived intangible assets amortization period | 13 years 4 months 24 days |  |
Unamortized capitalized software cost | $ 16,600 | 17,600 |
Amortization of capitalized software cost | 12,000 | 6,500 | $ 6,700
Deferred rent | $ 41,900 | $ 44,900 |
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 | 28.00% |  |

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