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Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for doubtful accounts | $ 11,279 | $ 17,220
Accrued vacation and bonus | 23,896 | 38,596
Deferred rent | 8,491 | 12,034
Share-based compensation | 15,108 | 24,783
Notes receivable from employees | 12,879 | 21,010
State net operating loss carryforward and credits | 3,586 | 4,169
Foreign net operating loss carryforward | 12,075 | 12,437
Future foreign tax credit asset and foreign tax credit carryforward | 7,403 | 2,545
Deferred compensation | 2,688 | 3,084
Other, net | 7,159 | 5,284
Total deferred tax assets | 104,564 | 141,162
Deferred tax liabilities |  |
Revenue recognition | (7,227) | (11,590)
Property, equipment and capitalized software | (2,308) | (6,527)
Goodwill and other intangible asset amortization | (190,638) | (273,990)
Total deferred tax liabilities | (200,173) | (292,107)
Foreign withholding tax | (1,035) | 0
Valuation allowance | (21,621) | (18,900)
Net deferred tax liabilities | $ (118,265) | $ (169,845)

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- Definition The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of capital assets and the basis of capital assets computed in accordance with generally accepted accounting principles. The difference in basis, attributable to different capitalization of costs, depreciation, or amortization methodologies, will increase future taxable income when such basis difference is realized. Capital assets include but are not limited to assets such as land, real estate, leasehold improvements, capitalized software, machinery and equipment and furniture and fixtures. + References No definition available. + Details
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