Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (174,744)	$ (190,155)	$ (190,486)	$ (154,870)
Other comprehensive income before reclassifications (net of tax)	(14,027)	15,484	(356)	(22,459)
Amounts reclassified from accumulated other comprehensive income (net of tax)	2,488	1,603	4,559	4,261
Other comprehensive income (loss)	(11,539)	17,087	4,203	(18,198)
Ending Balance	(186,283)	(173,068)	(186,283)	(173,068)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(59,622)	(75,561)	(73,041)	(34,224)
Other comprehensive income before reclassifications (net of tax)	(14,864)	16,704	(1,445)	(24,633)
Other comprehensive income (loss)	(14,864)	16,704	(1,445)	(24,633)
Ending Balance	(74,486)	(58,857)	(74,486)	(58,857)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(159)	5,122	(225)	2,356
Other comprehensive income before reclassifications (net of tax)	837	(1,220)	1,089	2,174
Amounts reclassified from accumulated other comprehensive income (net of tax)	107	(1,281)	(79)	(1,909)
Other comprehensive income (loss)	944	(2,501)	1,010	265
Ending Balance	785	2,621	785	2,621
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(118,399)	(116,994)	(120,714)	(120,260)
Amounts reclassified from accumulated other comprehensive income (net of tax)	2,613	2,918	4,928	6,184
Other comprehensive income (loss)	2,613	2,918	4,928	6,184
Ending Balance	(115,786)	(114,076)	(115,786)	(114,076)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	3,436	(2,722)	3,494	(2,742)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(232)	(34)	(290)	(14)
Other comprehensive income (loss)	(232)	(34)	(290)	(14)
Ending Balance	$ 3,204	$ (2,756)	$ 3,204	$ (2,756)