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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Summary of Components of Deferred Tax Assets and Liabilities | The table below summarizes significant components of deferred tax assets and liabilities:
| December 31,
| 2023 |  | 2022
Deferred tax assets |  |  |
Allowance for expected credit losses | $ | 7,597 |  |  | $ | 2,923 |
Accrued vacation and bonus | 47,115 |  |  | 37,776 |
Share-based compensation | 13,857 |  |  | 14,599 |
Notes receivable from employees | 10,770 |  |  | 11,927 |
State net operating loss carryforward | 172 |  |  | 537 |
Foreign net operating and capital loss carryforward | 13,487 |  |  | 11,852 |
Foreign tax credit carryforward | 14,384 |  |  | 4,199 |
Deferred compensation | 3,550 |  |  | 3,049 |
Operating lease assets | 64,649 |  |  | 64,465 |
Employee benefits obligations | 568 |  |  | 519 |
Other, net | 2,691 |  |  | 763 |
Total deferred tax assets | 178,840 |  |  | 152,609 |
Deferred tax liabilities |  |  |
Revenue recognition | (2,427) |  |  | (6,406) |
Operating lease liabilities | (52,673) |  |  | (51,995) |
Property and equipment, net | (13,216) |  |  | (12,956) |
Goodwill and intangible assets | (207,131) |  |  | (204,634) |
Total deferred tax liabilities | (275,447) |  |  | (275,991) |
Foreign withholding tax | (2,178) |  |  | (1,921) |
Valuation allowance | (6,773) |  |  | (6,459) |
Net deferred tax liabilities | $ | (105,558) |  |  | $ | (131,762) |
Summary of Components of Income Before Income Tax Provision from Continuing Operations | The table below summarizes the components of income before income tax provision from continuing operations:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Domestic | $ | 247,381 |  |  | $ | 165,553 |  |  | $ | 136,008 |
Foreign | 110,982 |  |  | 132,196 |  |  | 161,939 |
Total | $ | 358,363 |  |  | $ | 297,749 |  |  | $ | 297,947 |
Summary of Components of Income Tax Provision from Continuing Operations | The table below summarizes the components of income tax provision from continuing operations:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Current |  |  |  |  |
Federal | $ | 28,463 |  |  | $ | 24,227 |  |  | $ | 11,050 |
State | 18,878 |  |  | 12,935 |  |  | 8,328 |
Foreign | 38,029 |  |  | 34,917 |  |  | 37,656 |
| 85,370 |  |  | 72,079 |  |  | 57,034 |
Deferred |  |  |  |  |
Federal | 6,363 |  |  | (2,717) |  |  | 10,766 |
State | (3,514) |  |  | (1,173) |  |  | 3,458 |
Foreign | (4,748) |  |  | (5,954) |  |  | (8,277) |
| (1,899) |  |  | (9,844) |  |  | 5,947 |
Income tax provision | $ | 83,471 |  |  | $ | 62,235 |  |  | $ | 62,981 |
Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates | Our income tax provision from continuing operations resulted in effective tax rates that varied from the federal statutory income tax rate as summarized below:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Income tax expense at federal statutory rate | $ | 75,256 |  |  | $ | 62,526 |  |  | $ | 62,569 |
State income taxes, net of federal benefit | 12,562 |  |  | 10,486 |  |  | 8,643 |
Detriment from foreign tax rates | 9,418 |  |  | 5,811 |  |  | 4,375 |
Other expenses not deductible for tax purposes | 5,793 |  |  | 3,365 |  |  | 2,819 |
Adjustment to reserve for uncertain tax positions | (797) |  |  | (609) |  |  | 2,665 |
Share-based compensation | (5,422) |  |  | (9,372) |  |  | (6,167) |
Release of valuation allowance on foreign tax credits | — |  |  | (3,536) |  |  | — |
Income tax benefit related to the License Agreement, net | — |  |  | (2,034) |  |  | — |
Release of valuation allowance on Australian deferred tax asset | — |  |  | — |  |  | (5,063) |
U.S. foreign tax credits | (9,464) |  |  | (4,049) |  |  | (4,859) |
Valuation allowance on U.S. foreign tax credit carryforwards | — |  |  | — |  |  | 3,536 |
Deferred tax benefit of United Kingdom tax rate change | — |  |  | — |  |  | (3,167) |
Other adjustments, net | (3,875) |  |  | (353) |  |  | (2,370) |
Income tax provision | $ | 83,471 |  |  | $ | 62,235 |  |  | $ | 62,981 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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