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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense | Income tax expense (benefit) includes the following components:
|  |  | Federal |  |  | State |  |  | Foreign |  |  | Total |
| 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Current |  | $ | 37,551 |  |  | $ | 18,432 |  |  | $ | 193,996 |  |  | $ | 249,979 |
| Deferred |  |  | 8,440 |  |  |  | (69 | ) |  |  | — |  |  |  | 8,371 |
|  |  | $ | 45,991 |  |  | $ | 18,363 |  |  | $ | 193,996 |  |  | $ | 258,350 |
| 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Current |  | $ | 35,324 |  |  | $ | 13,711 |  |  | $ | 150,261 |  |  | $ | 199,296 |
| Deferred |  |  | 3,149 |  |  |  | 1,333 |  |  |  | — |  |  |  | 4,482 |
|  |  | $ | 38,473 |  |  | $ | 15,044 |  |  | $ | 150,261 |  |  | $ | 203,778 |
| 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Current |  | $ | 45,996 |  |  | $ | 13,262 |  |  | $ | 151,312 |  |  | $ | 210,570 |
| Deferred |  |  | (9,759 | ) |  |  | (2,272 | ) |  |  | — |  |  |  | (12,031 | )
|  |  | $ | 36,237 |  |  | $ | 10,990 |  |  | $ | 151,312 |  |  | $ | 198,539 |
Schedule of U.S. and Foreign Components of Income Before Income Tax Expense/(Benefit) | The components of earnings before income taxes are as follows:
|  |  | 2020 |  |  | 2019 |  |  | 2018 |
| United States |  | $ | 325,009 |  |  | $ | 327,878 |  |  | $ | 313,178 |
| Foreign |  |  | 631,555 |  |  |  | 467,916 |  |  |  | 505,151 |
|  |  | $ | 956,564 |  |  | $ | 795,794 |  |  | $ | 818,329 |
Schedule of Effective Income Tax Rate Reconciliation | Income tax expense differs from amounts computed by applying the United States Federal income tax rate of 21% when compared to earnings before income taxes as a result of the following:
|  |  | 2020 |  |  | 2019 |  |  | 2018 |
| Computed “expected” tax expense |  | $ | 200,879 |  |  | $ | 167,117 |  |  | $ | 171,849 |
| Increase (decrease) in income taxes resulting from: |  |  |  |  |  |  |  |  |  |  |  |
| Effect of foreign taxes |  |  | 48,584 |  |  |  | 26,599 |  |  |  | 16,445 |
| State income taxes, net of Federal income tax benefit |  |  | 14,507 |  |  |  | 11,885 |  |  |  | 8,682 |
| Nondeductible executive compensation |  |  | 4,324 |  |  |  | 2,838 |  |  |  | 3,126 |
| Stock compensation expense, net |  |  | (8,461 | ) |  |  | (2,689 | ) |  |  | (3,860 | )
| Other, net |  |  | (1,483 | ) |  |  | (1,972 | ) |  |  | 2,297 |
|  |  | $ | 258,350 |  |  | $ | 203,778 |  |  | $ | 198,539 |
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences and tax credits that give rise to significant portions of deferred tax assets and deferred tax liabilities are as follows:
| Years ended December 31, |  | 2020 |  |  | 2019 |
| Deferred Tax Assets: |  |  |  |  |  |  |  |
| Deductible stock compensation expense, net |  | $ | 14,265 |  |  | $ | 18,569 |
| Operating lease liabilities |  |  | 52,223 |  |  |  | 52,966 |
| Accrued third party obligations, deductible for taxes upon economic performance |  |  | 6,242 |  |  |  | 5,333 |
| Excess of financial statement over tax depreciation |  |  | 8,123 |  |  |  | 5,802 |
| Foreign currency translation adjustments |  |  | 4,604 |  |  |  | 9,248 |
| Retained liability for cargo claims |  |  | 1,128 |  |  |  | 1,006 |
| Provision for credit losses on accounts receivable |  |  | 954 |  |  |  | 916 |
| Total gross deferred tax assets |  |  | 87,539 |  |  |  | 93,840 |
| Deferred Tax Liabilities: |  |  |  |  |  |  |  |
| Unremitted foreign earnings, net of related foreign tax credits |  |  | 43,805 |  |  |  | 31,615 |
| Operating lease assets |  |  | 49,865 |  |  |  | 52,351 |
| Deferred contract costs |  |  | 917 |  |  |  | 1,840 |
| Total gross deferred tax liabilities |  |  | 94,587 |  |  |  | 85,806 |
| Net deferred tax (liabilities) assets |  | $ | (7,048 | ) |  | $ | 8,034 |

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