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Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (171,081)	$ (186,283)	$ (204,606)	$ (190,486)
Other comprehensive income before reclassifications (net of tax)	15,026	(2,725)	45,261	(3,081)
Amounts reclassified from accumulated other comprehensive income (net of tax)	2,304	2,656	5,594	7,215
Net current period other comprehensive income (loss)	17,330	(69)	50,855	4,134
Ending Balance	(153,751)	(186,352)	(153,751)	(186,352)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(66,879)	(74,486)	(100,448)	(73,041)
Other comprehensive income before reclassifications (net of tax)	16,559	(1,530)	50,128	(2,975)
Net current period other comprehensive income (loss)	16,559	(1,530)	50,128	(2,975)
Ending Balance	(50,320)	(76,016)	(50,320)	(76,016)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,097)	785	1,500	(225)
Other comprehensive income before reclassifications (net of tax)	(1,533)	(1,195)	(4,868)	(106)
Amounts reclassified from accumulated other comprehensive income (net of tax)	19	337	(1,243)	258
Net current period other comprehensive income (loss)	(1,514)	(858)	(6,111)	152
Ending Balance	(4,611)	(73)	(4,611)	(73)
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(105,824)	(115,786)	(110,656)	(120,714)
Amounts reclassified from accumulated other comprehensive income (net of tax)	2,424	2,464	7,256	7,392
Net current period other comprehensive income (loss)	2,424	2,464	7,256	7,392
Ending Balance	(103,400)	(113,322)	(103,400)	(113,322)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4,719	3,204	4,998	3,494
Other comprehensive income before reclassifications (net of tax)			1
Amounts reclassified from accumulated other comprehensive income (net of tax)	(139)	(145)	(419)	(435)
Net current period other comprehensive income (loss)	(139)	(145)	(418)	(435)
Ending Balance	$ 4,580	$ 3,059	$ 4,580	$ 3,059

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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

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