Segment Information - Schedule of Adjusted EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Total adjusted EBITDA	$ 612,526	$ 550,319	$ 1,796,045	$ 1,487,201
Depreciation, amortization and accretion expense	(306,318)	(277,719)	(921,611)	(749,118)
Stock-based compensation expense	(47,588)	(45,654)	(139,849)	(129,602)
Acquisition costs	1,120	(2,083)	(33,932)	(31,510)
Gain on asset sales	6,013	0	6,013	0
Income from operations	265,753	224,863	706,666	576,971
Americas [Member]
Segment Reporting Information [Line Items]
Total adjusted EBITDA	296,003	292,101	881,507	748,871
EMEA [Member]
Segment Reporting Information [Line Items]
Total adjusted EBITDA	179,797	146,464	516,790	417,640
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Total adjusted EBITDA	$ 136,726	$ 111,754	$ 397,748	$ 320,690

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

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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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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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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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

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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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