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Revenues - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 22,462 |  |  |  | $ 22,462 |  |  |
Deferred contract costs | 168,090 |  |  |  | 168,090 |  |  | $ 0
Contract liabilities | 195,035 |  |  |  | 195,035 |  |  | $ 0
Revenue from Contract with Customer, Excluding Assessed Tax | 2,090,947 |  |  | $ 1,802,166 | 5,902,768 | $ 5,019,577 |  |
Cost of Customs brokerage and other services | 1,887,793 |  |  | 1,615,271 | 5,323,212 | 4,518,328 |  |
Customs brokerage and other services |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 671,799 |  |  | $ 503,616 | $ 1,899,741 | $ 1,411,270 |  |
Prospective Change in Presentation Gross vs. Net | Customs brokerage and other services |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 50,000 | $ 50,000 | $ 50,000 |  |  |  |  |
Cost of Customs brokerage and other services | $ 50,000 | $ 50,000 | $ 50,000 |  |  |  |  |
Revenue Accounting Standards Update |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | $ 22,000 |
Deferred contract costs |  |  |  |  |  |  | 135,000 |
Contract liabilities |  |  |  |  |  |  | $ 165,000 |

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