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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, allowance for doubtful accounts | $ 15,345 |  |  |  | $ 12,858 |  |  |  | $ 15,345 | $ 12,858 | $ 9,247 |  |
Net foreign currency gains (losses) |  |  |  |  |  |  |  |  | (1,853) | (13,315) | 7,955 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred contract costs | 159,510 |  |  |  | 0 |  |  |  | 159,510 | 0 |  |  | $ 135,000
Revenues | 2,235,597 | $ 2,090,947 | $ 1,957,559 | $ 1,854,262 | 1,901,371 | $ 1,802,166 | $ 1,672,279 | $ 1,545,132 | 8,138,365 | 6,920,948 | 6,098,037 |  |
Costs and Expenses |  |  |  |  |  |  |  |  | 7,341,802 | 6,220,688 | 5,427,874 |  |
Contract liabilities | $ 190,343 |  |  |  | $ 0 |  |  |  | 190,343 | 0 |  |  | 165,000
Customs brokerage and other services |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,614,679 | $ 1,936,871 | $ 1,727,196 |  |
Prospective Change in Presentation Gross vs Net | Customs brokerage and other services |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 225,000 |  |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | $ 225,000 |  |  |  |
Revenue Accounting Standards Update |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,000
Leases Accounting Standards Update | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  | $ 370,000 |
Operating Lease, Liability |  |  |  |  |  |  |  |  |  |  |  | $ 370,000 |

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