Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2018		Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017		Jan. 01, 2019	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 11,143								$ 15,345								$ 11,143		$ 15,345		$ 12,858
Cumulative adjustment for adoption of new accounting pronouncement																								$ 22,000
Deferred contract costs	131,783								159,510								131,783		159,510					135,000
Contract liabilities	154,183								190,343								154,183		190,343					$ 165,000
Revenue from Contract with Customer, Excluding Assessed Tax	2,044,941	[1]	$ 2,074,855		$ 2,035,579		$ 2,020,051		2,235,597	[1]	$ 2,090,947		$ 1,957,559		$ 1,854,262		8,175,426	[2]	8,138,365	[2]	6,920,948	[2]
Costs and Expenses																	7,408,734		7,341,802		6,220,688
Net foreign currency gains (losses)																	(9,251)		(1,853)		(13,315)
Operating lease, right-of-use asset	390,035								$ 0								390,035		0
Operating lease, liability	$ 391,714																391,714
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset																							$ 343,000
Operating lease, liability																							$ 340,000
Customs brokerage and other services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax																	$ 3,027,990		2,614,679		$ 1,936,871
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																			225,000
Costs and Expenses																			$ 225,000

[1] The fourth quarter of 2019 was significantly impacted by declines in results in our China operations due to the slowing of trade to and from China, which impacted overall freight movement around the globe. The Company’s consolidated financial results are expected to be further impacted in 2020 due to the significance of its China operations and the effects of the recent outbreak of the Novel Coronavirus (COVID-19). See Note 12 for further detail. In the fourth quarter 2019 and 2018, the People's Republic of China, including Hong Kong, represented 25% and 31%, respectively, of the Company’s total revenues and 25% and 27%, respectively, of the Company’s total operating income.

[2] In 2019, the Company revised its process to record the transfer, between its geographic operating segments, of revenues and the directly related cost of transportation and other expenses for freight service transactions between Company origin and destination locations. This change better aligns revenue reporting with the location where the services are performed, as well as the transactional reporting being developed as part of the Company’s new accounting systems and processes. The change in presentation had no impact on consolidated or segment operating income. The 2019 results also include the effect of changing the presentation of certain import services from a net to a gross basis, which increased segment revenues and directly related operating expenses but did not change operating income. The impact of these changes on reported segment revenues was immaterial and prior year segment revenues have not been revised.