Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components Of Other Comprehensive Income Loss [Line Items]
Marketable securities, Balance at beginning of period	$ 195	$ 47,112
Other comprehensive loss - unrealized losses arising during the year	(1,531)	(1,786)
Marketable securities, Balance at end of period	(1,336)	45,326
Currency translation, Balance at beginning of period	(172,384)	(154,173)
Other comprehensive income (loss)	2,831	(12,959)
Currency translation, Balance at end of period	(169,553)	(167,132)
Interest rate swap, Balance at beginning of period	(445)
Unrealized losses arising during the year	(683)
Less reclassification adjustment for amounts included in interest expense	112
Interest rate swap, Balance at end of period	(1,016)
Balance at beginning of period	(245,358)	(182,039)
Other comprehensive income (loss)	1,404	(14,147)
Balance at end of period	(243,954)	(196,186)
Defined Benefit Pension Plans
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(72,712)	(75,260)
Other comprehensive income (loss) - amortization of prior service credit and net losses (gains) included in net periodic pension cost	807	734
Balance at end of period	(71,905)	(74,526)
OPEB
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(12)	282
Other comprehensive income (loss) - amortization of prior service credit and net losses (gains) included in net periodic pension cost	(132)	(136)
Balance at end of period	$ (144)	$ 146