Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 30, 2017	Mar. 31, 2019	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017	[3],[4]
Assets:
Foreign exchange contracts			$ 72,100		$ 68,800
Total assets			1,010,689		723,163
Cash collateral for foreign exchange contracts			25,600		73,100
Liabilities:
Foreign exchange contracts			60,900		72,100
Total liabilities			117,327		72,125
Cash collateral obligation for foreign exchange contracts			6,100		9,600
Net unrealized gains on equity securities			13,000
Impairment loss on investment			3,470	[1],[2]	7,147	$ 53,164
Repurchase agreements
Assets:
Cash and cash equivalents			833,658		581,293
Money market
Assets:
Cash and cash equivalents			54,978		50,644
Certificates of deposit
Assets:
Cash and cash equivalents			27,022		22,412
Trading Securities
Assets:
Cash and cash equivalents			22,955
Level 1
Assets:
Total assets			22,955		21
Liabilities:
Total liabilities			0		0
Level 1 | Repurchase agreements
Assets:
Cash and cash equivalents			0		0
Level 1 | Money market
Assets:
Cash and cash equivalents			0		0
Level 1 | Certificates of deposit
Assets:
Cash and cash equivalents			0		0
Level 1 | Trading Securities
Assets:
Cash and cash equivalents			22,955
Level 2
Assets:
Total assets			987,734		723,142
Liabilities:
Total liabilities			117,327		72,125
Level 2 | Repurchase agreements
Assets:
Cash and cash equivalents			833,658		581,293
Level 2 | Money market
Assets:
Cash and cash equivalents			54,978		50,644
Level 2 | Certificates of deposit
Assets:
Cash and cash equivalents			27,022		22,412
Level 2 | Trading Securities
Assets:
Cash and cash equivalents			0
Level 3
Assets:
Total assets			0		0
Liabilities:
Total liabilities			0
Level 3 | Repurchase agreements
Assets:
Cash and cash equivalents			0		0
Level 3 | Money market
Assets:
Cash and cash equivalents			0		0
Level 3 | Certificates of deposit
Assets:
Cash and cash equivalents			0		0
Level 3 | Trading Securities
Assets:
Cash and cash equivalents			0
Interest Rate Swaps
Liabilities:
Foreign exchange contracts			56,418
Interest Rate Swaps | Level 1
Liabilities:
Foreign exchange contracts			0
Interest Rate Swaps | Level 2
Liabilities:
Foreign exchange contracts			56,418
Interest Rate Swaps | Level 3
Liabilities:
Foreign exchange contracts			0
Foreign exchange contracts
Assets:
Foreign exchange contracts			72,076		68,814
Cash collateral for foreign exchange contracts			6,086		9,644
Liabilities:
Foreign exchange contracts			60,909		72,125
Cash collateral obligation for foreign exchange contracts			25,618		73,140
Foreign exchange contracts | Level 1
Assets:
Foreign exchange contracts			0		21
Cash collateral for foreign exchange contracts			0		0
Liabilities:
Foreign exchange contracts			0		0
Cash collateral obligation for foreign exchange contracts			0		0
Foreign exchange contracts | Level 2
Assets:
Foreign exchange contracts			72,076		68,793
Cash collateral for foreign exchange contracts			0		0
Liabilities:
Foreign exchange contracts			60,909		72,125
Cash collateral obligation for foreign exchange contracts			0		0
Foreign exchange contracts | Level 3
Assets:
Foreign exchange contracts			0		0
Cash collateral for foreign exchange contracts			0		0
Liabilities:
Foreign exchange contracts			0
Cash collateral obligation for foreign exchange contracts			0		0
Telematics
Liabilities:
Impairment loss on investment		$ 15,700
Impairment loss, cumulative amount			136,300
Carrying amount of investments without readily determinable fair value			7,400
Qui
Liabilities:
Impairment loss on investment					$ 7,100
Masternaut
Liabilities:
Impairment loss on investment	$ 44,600		15,600
Impairment loss, cumulative amount			$ 136,300

[1] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019 using the modified retrospective transition method. The adoption of the Leases guidance resulted in an adjustment to other assets, other current liabilities and other noncurrent liabilities in our consolidated balance sheet for the cumulative effect of applying the standard. Financial results reported in periods prior to 2019 are unchanged.

[2] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using a modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 14.

[3] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230), which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the statement of cash flows.

[4] The Company applied the modified retrospective transition method when adopting ASC 606, therefore the Company's 2017 prior period results were not restated to reflect ASC 606.