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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	$ 6,199,379		$ 6,199,379		$ 6,032,951
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss (income), net of tax, beginning balance			(702,227)
Net current period other comprehensive income (loss)	(11,005)	$ (71,919)	33,868	$ (55,016)
Accumulated other comprehensive loss (income), net of tax, ending balance	(668,359)	(692,498)	(668,359)	(692,498)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	(368,633)		(368,633)		(396,996)	$ (297,416)
OCI, before Reclassifications, Net of Tax, Attributable to Parent			28,363	(70,461)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			28,363	(70,461)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss (income), net of tax, ending balance		(367,877)		(367,877)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent					4,746	(10,332)
OCI, before Reclassifications, Net of Tax, Attributable to Parent			4,581	4,971
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			4,263	(4,955)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			318	9,926
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss (income), net of tax, ending balance	5,064	(406)	5,064	(406)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent					(309,977)	(329,734)
OCI, before Reclassifications, Net of Tax, Attributable to Parent			0	186
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			(5,187)	(5,333)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			5,187	5,519
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss (income), net of tax, ending balance	$ (304,790)	$ (324,215)	(304,790)	(324,215)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent					$ (702,227)	$ (637,482)
OCI, before Reclassifications, Net of Tax, Attributable to Parent			32,944	(65,304)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			$ (924)	$ (10,288)

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Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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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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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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