Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (190,486)	$ (154,870)	$ (75,357)
Other comprehensive income before reclassifications (net of tax)	(28,408)	(43,926)	(89,608)
Amounts reclassified from accumulated other comprehensive income (net of tax)	14,288	8,310	10,095
Other comprehensive loss	(14,120)	(35,616)	(79,513)
Ending Balance	(204,606)	(190,486)	(154,870)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(73,041)	(34,224)	15,141
Other comprehensive income before reclassifications (net of tax)	(27,407)	(38,817)	(49,365)
Other comprehensive loss	(27,407)	(38,817)	(49,365)
Ending Balance	(100,448)	(73,041)	(34,224)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(225)	2,356	(941)
Other comprehensive income before reclassifications (net of tax)	1,247	1,620	2,826
Amounts reclassified from accumulated other comprehensive income (net of tax)	478	(4,201)	471
Other comprehensive loss	1,725	(2,581)	3,297
Ending Balance	1,500	(225)	2,356
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(120,714)	(120,260)	(89,547)
Other comprehensive income before reclassifications (net of tax)	(4,334)	(12,995)	(40,266)
Amounts reclassified from accumulated other comprehensive income (net of tax)	14,392	12,541	9,553
Other comprehensive loss	10,058	(454)	(30,713)
Ending Balance	(110,656)	(120,714)	(120,260)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	3,494	(2,742)	(10)
Other comprehensive income before reclassifications (net of tax)	2,086	6,266	(2,803)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(582)	(30)	71
Other comprehensive loss	1,504	6,236	(2,732)
Ending Balance	$ 4,998	$ 3,494	$ (2,742)