Segment Information - Schedule of Adjusted EBITDA (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 1,271,627	$ 1,113,891	$ 1,000,898
Depreciation, amortization and accretion expense	(528,929)	(484,129)	(431,008)
Stock-based compensation expense	(133,633)	(117,990)	(102,940)
Restructuring charges	0	0	4,837
Acquisitions costs	(41,723)	(2,506)	(10,855)
Income from operations	567,342	509,266	460,932
Americas [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	698,604	635,007	608,718
EMEA [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	318,561	269,222	216,186
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 254,462	$ 209,662	$ 175,994

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

No definition available.

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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.

+ References

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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.

+ References

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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.

+ References

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

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No definition available.

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- Definition

Amount of (expense) reversal of expense related to a previously accrued restructuring cost liability. Excludes adjustments for costs incurred, costs settled, and foreign currency translation adjustments.

+ References

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-Publisher FASB
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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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