Segment Information - Schedule of Adjusted EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total adjusted EBITDA	$ 604,004	$ 509,308	$ 1,183,519	$ 936,882
Depreciation, amortization and accretion expense	(308,828)	(252,386)	(615,293)	(471,399)
Stock-based compensation expense	(49,725)	(45,625)	(92,261)	(83,948)
Acquisition costs	(30,413)	(26,402)	(35,052)	(29,427)
Income from operations	215,038	184,895	440,913	352,108
Americas [Member]
Segment Reporting Information [Line Items]
Total adjusted EBITDA	293,955	258,151	585,504	456,770
EMEA [Member]
Segment Reporting Information [Line Items]
Total adjusted EBITDA	170,815	141,622	336,993	271,176
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Total adjusted EBITDA	$ 139,234	$ 109,535	$ 261,022	$ 208,936

Adjusted earnings before interest, taxes, depreciation and amortization/accretion.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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- Definition

The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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